Category: Dye plants

Foraging for dye plants

Wiese mit Faerberpflanzen, bluehender Wilder Moehre

Summer is abundant with plants and flowers! An invitation to smell blooms on walks, to stare dreamily into the canopy while lying on a meadow – or to forage and dye.
If you are not familiar to gathering wild plants, I would like to introduce you to some things to consider. And at the end of this post you'll see three plants that you are sure to find if you're not located too far from here.

Plants take care of us - plants grow food, medicine, fibers that clothe and warm us, can be a roof over our heads when it rains, and they also contain dyes. Anything one could really ask for. When I remind myself of that, I feel so very grateful. And I want to return this generosity with consideration and respect.

With all the abundance, the forest, the meadow, are not a supermarket - not everything is always available in reliable quantities, and the shelves are not regularly replenished once there empty. In no way does this mean that we should only gaze at wild plants from afar, and look at nature as something we're no part of. Quite the contrary - I recommend to get familiar and immerse oneself.

Kennst du deinen Ort?

Location is important to consider for foagering. Where are you? You should not collect in protected areas. Different rules may apply in parks and gardens. Especially in places that are frequented by many people, such as inner-city parks, I collect leaves or acorns only when they have fallen to the ground (or after cutting). Are there only a few flowers in one place, or have the very first early blooms awakened? Then insects that collect pollen or nectar have priority.
A nice side effect of getting to know your place, becoming familiar, might be a growing sense of home and groundedness. I feel rooted when observing my surroundings, when I get to know the plants I visit again and again throughout the year.

Get to know the plants

... that you want to pick. There are some poisonous plants, some of which are lookalikes of non-poisonous plants. There are plenty of dye plants, usually you can find good alternatives to poisonous plants.

If you are unsure, take a photo of the plant, then you can have it identified (or try your luck with an identification app). Photos of the location and of the leaves, the stalk, the flower and/or fruit are even better to identify a plant than a branch or a single picked leaf. And the plant can stay put. Field guide books can be helpful, and I'd recommend to join foraging tours or guided walks in your location. Or visit local botanical gardens or herb gardens. Especially smaller, community led ones, often showcase local flora.

But back to foraging: only take it with you if you recognize the plant. And only cut whatever you want to take it with you. Maybe you also know this rule from unenthusiastically mushroom picking as a child?

Of course, there are also rare, protected plants - maybe the probability is (unfortunately) not that great that you will find one. But that's another reason we shouldn't pick any unknown plants.

Are you out and about in the forest or on pristine meadows? From April and throughout summer you should stick to the trails while foraging, especially if you are not that familiar with the place and the wildlife. In order to not disturb ground-breeding birds and other animals. The good news is that there are often remarkably diverse plants along paths and trails anyway!

Some practical foraging guidelines

So, you are not in a protected area, the plants in front of you are not rare. How to proceed now?
Regulations on that topic may differ, but to my surprise the German legal take on foraging is quite clear and easy to understand. There is the so-calledHandstraußregelung“:
Which could be translated as bouquet regulation. "Everyone is allowed to carefully remove and acquire small quantities of wild flowers (...) and branches of wild plants from nature in places that are not subject to entry restrictions for personal use."

Other guidelines by herbalists are: don't take more than you need, and only when there is plenty.

I like this idea that the place you foraged in should pretty much look like before once you're done – with plenty of fruit, seeds, flowers still in place! I only forage wild plants when they're abundant. I prefer to take a little from each plant (depending on the plant it might be a flower, a few twigs or leaves). I'd rather pick the tip and encourage more new growth instead of the entire plant. A friend recently told me, whenever she sees an insect or a bird on a plant she skips it, leaving it to them. On an event by Wildwärts I heard "one part for you, one for the plant, and one for the fairies", which I think is especially good for children to remember!

Give and take

In Braiding Sweetgrass by Robin Wall Kimmerer (now also available in German ) there is an entire chapter Honorable Harvest, which I'd recommend to read (as the entire book). The author highlights respect and reciprocity, kinship, as guidelines fo foraging, integral to her indigenous heritage. That means, among other things: never take the first and never the last thing you see (i.e. nothing under certain circumstances). The plants take care of us, how can we respectfully reciprocate? Nature is generous, giving - and wherever you are given to, you only take what you can use, you share, you don't steal. A forest, meadow, garden is not the place for greed because there is no shortage. It is also important to ask the plants for permission before harvesting. Which might sound the most unfamiliar as it is so opposed to how many of us are taught to view plants. But something to ponder, and things to un- and relearn?

Personally, I don't harvest roots for dyeing in the wild. So perennials can sprout again. I leave flowers so that they can form seeds. And for stubborn stems, it's good to have scissors or a knife with you to avoid accidentally uprooting entire plants. I collect in cloth bags or paper bags that used to contain fruit or vegetables, to easily transport the plants. And if I remember to, I'll also have a plastic bag with me to collect plastic trash lying around. For a bit of practical reciprocity between me and my environment.

Three dye plants that you can probably find

At the moment I at least see these three plants all the time, on walks in the country side and in the city.

Mugwort, Artemisia vulgaris

... is a traditional medicinal plant that used to be used in a variety of ways. It was also used as a herb in greasy heavy foods to aid digestion. Today mugwort is rarely used for both, so why not test it for dyeing?

Mugwort rather easy to recognize by its pinnate leaves with the typical silver-gray underside.

I harvested it for dyeing just before it bloomed. But if you're allergic to mugwort, as many are, you might just leave this plant alone. I harvested my mugwort bouquet from the side of the road, on the way to our little garden. Road sides are where you can see it very often, also on fallow land, at construction sites and in parks that are not constantly mowed.

I walked down the street for a bit, with scissors the cut the firm stems, and harvested only a few tips from each plant along the way. And I already spied a lot of goldenrod, which will also soon bloom throughout the city.

Stoffe und Wolle gefaerbt in hellen Grüntönen, mit einem getrockneten Beifuß-Blatt

Canadian goldenrod, Solidago canadensis

You can read even more on this plant in a previous post. It is definitely one of the dye plants that grow abundantly here, and like mugwort goldenrod is also a medicinal plant. You can use both leaves and flowers for dyeing. I especially like to harvest the flower stalks with the upper leaves before the buds open.

If you look closely, you can spot goldenrod everywhere even now, in mid-July. But once it blooms in late summer, it really can't be missed with its bright yellow flowers!

In some areas there is even a recommendation to remove this plant, as it can spread a lot with its rhizomes. It can crowd out other plants in certain biotopes, and so Canadian goldenrod, once introduced as an ornamental plant, often does not have the best reputation.

In my alotment, goldenrod it is allowed to grow. I harvest some of it, and remove plants where they take over. I then dye with them, or even make myself a tea. And otherwise I enjoy the flowers, and the droves of insects that they attract.

So, maybe there are actions in your area to remove goldenrod in specially protected landscapes? There you could harvest to your heart's content. But unless this is specified: the same rules apply to goldenrod as to other wild plants. But you can surely fill a dye pot with this plant, as abundant as it tends to grow.

Wild carrot, Daucus carota

I love the delicate flowers of Wild carrot, or Queen Anne's Lace, and so usually I do not pick any of them. Instead I use the green tops of my garden carrots – with both you can dye beautiful yellows.
But this year I have seen them in such large quantities that I could have picked a bouquet after all.
And Wild carrot is well suited even for beginner foragers because, unlike many other umbellifers, it can be clearly identified. There are some poisonous plants in this family, and many umbellifers (or apiaceae) do look quite similar. For example, cow parsely, as a non-poisonous dye plant, is very easy to mix up with the poisonous rough chervil or the very poisonous hemlock.

So, Wild carrot can be identified by the shape of its inflorescences, which look like fine, dense nests or an inverted lace cap (hence the name Queen Anne's lace, I assume). And you can look for the biggest of it's flower stalks - it should have a red (sometimes pink) or almost black flower in the middle of all the tiny white flowers. None of the poisonous umbellifers in our area have a similar "dot" in the centre of their flower clusters. For dyeing you can harvest both inflorescence and leaves.

In the past months I have had quite a few conversations on this topic that eventually inspired me to write on it, too. For example with Julia from Berliner Zauberkraut, who manufactures biological cleaners, and Tash from Avantgarden.Life, who also offers foraging workshops, focussing on herbal medicine.

And here's a post by Julia on ethical foraging, with contributions by makers from the Hexenküche Community (a community that grew from pop up shops with lots of local herbal and plantbased products).

All information is researched to the best of my knowledge and belief. You should not pick unknown plants or dye with them. I assume no liability for any negative consequences.

Auf Pinterest merken.

Books about dyeing with plants: A few favourites

Buecher zum Faerben mit Pflanzen

Dye books for everyone: for makers, botanists and historians

In my workshops, which are now on hold due to the pandemic, there is more than just dye pots and learning through making. I always share lots of dye samples to look at, and books about dyeing with plants for inspiration.
The plant dyeing workshops are more than just learning and discovering together. They can be s space for community and exchange (something that we probably all miss in this time of zoom conferences); trying something without having to buy a lot of tools or materials beforehand; rummaging through various dye books, and perhaps discovering exactly the book that suits you. And at least the latter might work quite well here too!

Are you looking for a book that you can immerse yourself in, perhaps during lockdown? I've already got a number of books on plant dyes on my shelves, and still quite a few on my all-time wish-list ... But I've also been a real bookworm ever since I was able to read. Choosing my top five picks wasn't easy, but here are the ones I keep going back to most often Some of them are unfortunately only available in German, but all five are great to browse for a variety of reasons.

Jenny Dean: Wild Color. The Complete Guide to Making and Using Natural Dyes

There are several editions of this book (mine is from 2010 Watson-Guptill Publications) - as far as I know, they are largely the same in content. (Please let me know if I'm wrong.)

This is my big recommendation to start with plant dyeing. The book begins with a historical introduction, and then offers a really comprehensive overview of different fibers, plants, methods - it remains easy to understand even for beginners. But even with ten years of dyeing experience, I still go to this book to look some things up, so I think it is a great choice.
I especially like the second part, “The Dye Plants”. On one or two pages there is background information on plants, cultivation, harvest and dyeing. Also a photo and a small color index on the edge. With all the variables in plant coloring, it is clear that the index is more of an inspiration than the exact tone you will be coloring yourself. But I still find it very helpful and inspiring when leafing through.

Not entirely unimportant, the author is British and dyes primarily with the plants that surround her - but the plant part is still relevant for German readers. With the exception of a few historical dye plants from Central America, almost all of them can also be found here. Unlike, for example, some books with a focus on North American flora, which are beautiful and interesting, but work with plants that simply do not grow here and need to be imported.

A recommended book for everyone who wants to start dyeing with plants. And for those who already have experience but would like to have a good standard work on the subject, too!

Eberhard Prinz: Färberpflanzen. Anleitung zum Färben, Verwendung in Kultur und Medizin

2009/2014 Schweizerbart

So far this book is only available in German. It is a great book for anyone who wants to forage for plants for dyeing themselves. It begins with chapters on the various natural dyes, dyeing and auxiliary substances. But the majority of the book is made up of the chapter “Dye Plants”. And that's also the part that I keep browsing.

There are plant portraits on 250 pages (in my 2014 edition). A full-page photo of each plant, a brief description of how it can be used for dyeing, often classifications on lightfastness, and information on other cultural or medical uses. If a plant is poisonous, it is always pointed out - a very important topic that's sometimes easy to forget in the excitement of discovering botanical dyes.

For each plant there is a short profile with the origin of the plant, the approximate colour range, more details on the most important dyes it contains and an overview of countries in which it was traditionally used.

A nice dye book for your (German) botany-obsessed friend!

Joy Boutrup, Catherine Ellis: The Art and Science of Natural Dyes. Principles, Experiments, and Results.

2018 Schiffer Publishing

I find this book outstanding. The authors bring together decades of experience and specialist knowledge from textile art, chemistry and textile technology and historical dyeing techniques.

I would rather recommend it to those who already have some experience with dyeing and want to deepen their understanding. Because in addition to practical instructions, this book explores the “mechanisms” in dyeing: why does something work this way, not another, and why only on some fibres? It also discusses printing with dyes, and indigo organic vats in detail.

All subjects are illustrated with photos and a few illustrations, but overall it is a very text-heavy coloring book.

Would you like to explore complex textile techniques with plant dyes, combine different colors and techniques, print, dye, discharge? Then you will find this book very helpful. Otherwise it is the ideal dyeing book for all chemistry enthusiasts (as myself).

Helmut Schweppe: Handbuch der Naturfarbstoffe. Vorkommen, Verwendung, Nachweis

1993 Nikol Verlag

Another book that's only available in German: This book is only available to buy second-hand, but often at a reasonable price compared to other books that are out of print - and at 800 pages it is a real tome. I also wondered if that's why it should be on this list at all.

But I am sure it wasn't only me who – before the internet changes things so drastically – liked to browse lexicons, study illustrations and get to know previously unfamiliar words, places and people - and this manual is just perfect for that!

Today we can find almost anything online with a search engine, but leafing through a thick encyclopedia has a very special charm. The history of natural dyes from "very early" until the 19th century is dealt with with many tables of the plants used. It lists the different groups of dyes in nature, also with structural formulas (and that on about 400 pages). The last part deals in detail with the various ways in which these dyes can be detected. This is not so relevant for dyers in everyday life, but it is very exciting, because it allows historical fabrics or textile fragments uncovered by archaeologists to be examined and determined.

This book is the right one for those who like to browse and read across a long book, or who want to look up specific plants or regions from time to time.

Dominique Cardon, Iris Brémaud: Le Cahier de Couleurs d’Antoine Janot. Workbook, Antoine Janot’s Colours.

2020 CNRS Editions

Hopefully more will follow this little booklet about historical coloring with plants. It is a bilingual edition. In French and English there is an insight into the work and color palette of the French master dyer Antoine Janot from the first half of the 18th century.

With a lot of research, the authors have put pieces of the puzzle together and supplemented written recipes with preserved textile dye samples. When reproducing the colors, great importance was attached to being as close as possible to the original.
The book is intended more as an inspiration than a guide, some of the ingredients are no longer in use today. The wonderful colors and their names between pictorial, poetic and drastic (Dead leaf, Rotten olive green, Wine soup) are a pleasure. And the small glimpse into the precision with which the dyer Janot worked and figured out color recipes is really impressive.

This book is for you if you are interested in the history of this craft.

Keep reading and learning new perspectives

This list is of course not intended to be exhaustive or exhaustive. There are a few other books about dyeing with plants that I find very valuable, and some that I'm still very curious about! Maybe you have another book tip that you want to share? For the next year I have decided to look especially for books with a different perspective on the topic - for books on the topic by BIPoC authors - feel free to write to me if you have a recommendation!

Are you more interested in historical dyeing, but very practical? Jenny Dean’s "A Heritage of Color. Natural Dyes Past and Present" is also a booklet worth reading. Here the author approaches experimentally and practically, how (and which) natural dyes were uses on the British Isles historically.

Faerbebuecher bei Pinterest merken
Save to Pinterest

Dyeing yellow with goldenrod

Gelbe Stoffe gefaerbt mit Goldrute und Faerbetopf

From late summer onwards it can hardly be overlooked and is in full bloom: The time has come to dye beautiful yellows with goldenrod. Comparing my garden today on September 1st, 2020, with photos from previous years, it probably started to blossom earlier this year than in previous years. But it's still not too late to get your dye pots ready!

Goldenrod is one of the Dye plantsin my garden that just grow without any of my doing. This perennial reproduces through seeds, but also through rhizomes (i.e. underground) and has come to us from our neighboring garden. I harvest it abundantly, and wherever it threatens to take over beds, I dig it up.

Canadian goldenrod is the most common variant here now, Solidago canadensisIt is classified as a neophyte, meaning it was introduced in Europe after 1492. As the name suggests it is native to North America. "Neophyte", an invasive species that has been introduced, the vocabulary does not sound too friendly – but of course the plant did not migrate here on its own, even with bad intentions, but was brought to Europe as a valued ornamental plant. Although widespread in Germany, Canadian goldenrod is only rated problematic in a few areas here. According to the Federal Agency for Nature Conservation it has only a small impact on endangered species.So no reason to start removing goldenrod anywhere you see it! Goldenrod keeps blooming late in the season and is great for pollinating insects, and just as European goldenrod, Solidago virgaurea, is considered a medicinal plant.

Dyeing with goldenrod

I love to dry and store goldenrod to use in winter, as it is so abundant here. But I have heard from several dyers they don't get as clear yellow tones from dried goldenrod.

Edit: I suspect these unreliable dye results from dry goldenrod might have something to do with water quality. The Berlin tap water I use is very hard and has a neutral to minimally alkaline pH. If your water is very soft or acidic, and you have no success with this dye plant, try adding chalk (calcium carbonate). Here Catherine Ellis has written about the effect of pH on yellow dyes, I highly suggest to take a look.

All that said, it's the easiest to dye with fresh goldenrod while it's in season. Compared to other yellow plant dyes, such as dyer's chamomile and weld, I tend to use more plant material with goldenrod for bright dye results. But as it grows practically everywhere, that's no problem as long as the dye pot is big enough!
You can use flowers, flowers and leaves, for dyeing. The former dyes somewhat cleaner tones. When heating the plant matter and when dyeing, I make sure that it doesn't get too hot. If the dye is boiling for a longer period of time, the colour sometimes tends to have a brownish tinge instead of a rich yellow.

As always when dyeing with plants: it's well worth taking your time with it. That begins with preparing fabric or woolen yarn. Pre-mordanting is particularly important on plant fibres such as cotton fabric (it is in general, but especially so with this dye plant). Goldenrod dye takes definitely better to wool and silk - which does not mean that it is not worth experimenting with cotton fabrics!

Here I used as much goldenrod as I could fit in my pot. I didn't weigh any plants or fabric samples - but all fabrics were mordanted beforehand. And again and again I find it exciting to see how different mordants affect the color! I poured water on the flowers and slowly warmed them up and simmered for about two hours. For dyeing I poured everything through a cloth, squeezed out the flowers, and then put fabrics and woolen thread in it. And after the first round, I dyed other fabrics to exhaust the dye bath.

Drying goldenrod for the winter

To store goldenrod, I cut the flowering shoots so that I mainly harvest flowers and a few leaves. If there are already small side shoots, I cut above them so they flower again soon. It is best to harvest the flowers before they have fully opened, otherwise they ripen into fluffy seeds that spread everywhere like tiny parachutes.
To dry them, I hang goldenrod bouquets upside down, or lay them on paper or a lattice. In a dry and shady place, in my case in our garden shed. Once dry, I put them in large paper bags or cloth bags. To save space, you can strip the dry leaves and flowers off the almost woody stems before packing them.

To dye with the stored goldenrod, I first soak the dried plant in cold water overnight before carefully heating them to extract the dye.

Natural blue: Salt and fresh indigo leaves

Frische Blaetter von Japanischem Indigo zum Faerben

I really appreciate this way of dyeing with fresh indigo for its accessibility. You don't need special equipment or ingredients, just fresh leaves from your indigo plants, and some salt to coax the blue out from the lush green leaves of Dyer's knotweed, Polygonum tinctorum,I have also used this method with woad, Isatis tinctoria, and achieved beautiful colors, albeit lighter and more greenish. All it takes is a small amount of salt and the fabric. Compared to the various indigo vats that are used to dye blue, this is a lot simpler.

A Japanese craft, travelling the world

I think the first time I saw this method was in one of my favourite online spaces – a Facebook group of all things! „Indigo pigment extraction methods“ I highly recommend to join the group if you want to grow any indigo plant. A global community sharing experiments, learning, questions. The group is brillant! Whether you are gardening in pots or in a large field, here you will find others who are trying the same, helpful documents and a place for questions that might arise. The group was founded by Brit Boles, also known as seaspellfiber on Instagram.
So that's where I first saw this video, of a Japanese indigo dyer, and her demonstrating this "salt rub method". The dyery, Ohara Koubou, is located north of Kyoto.

How to dye blue with indigo and salt

This method works best on animal fibers such as silk and wool. You can pre-treat vegetable fibers with soy milk if you want to dye them using this method.
Pick the leaves - for a strong color it should be at least twice the weight of the fabric in leaves. Work as quick as possible. This method works thanks to enzymes in the leaves, which are broken down by heat over time.
I tear the leaves once and start adding a tablespoon of salt. Now the leaf mass is kneaded with the salt until more and more liquid comes out - depending on the amount of leaves add a little more salt. Then add the fabric (previously soaked in water and squeezed out) into the mass and massage the liquid into the fabric. When you're dyeing wool, rubbing it can felt the fibers. In that case, just gently knead the liquid into the fiber.

Depending on the time of harvest and the fiber, the hues vary from blue to more turquoise-green tones. My dye results with woad leaves were particularly variable - I only got real shades of blue with the dye knotweed. If you want to dye a more "typical" indigo blue, I'd recommend vatting your indigo.
But you can also use the salt method for deeper shades. To do this, overdye several times. However, you will need fresh indigo leaves for this, unlike a vat, in which you can dip your fibers repeatedly.
I hope give this method a try! I look forward to the time the plants are ready for it every year.

Local colour, global context

I think it's great and important to experience dye plants in a very local and accessible manner. Gardens and even overlooked backyards are so valuable to enable that. And it's so very empowering to be able to dye textiles ourselves with means that are understandable and tangible. For me, this is a very important part of a sustainable clothing culture. At the same time I ask myself more and more – where is the line between appreciation and cultural appropriation is. In this case, too. (There are many interesting thoughts on this tagged with #decolonisethegarden on Instagram.)

The spreading of plants to other places is “natural” and part of their survival strategy. There is also a long history of people who cherished, cultivated and took plants with them and thus spread them. But I want to look closely: How easily is the reality of colonization re-told and made invisible. Like the rest of our world, our gardens would look very different without the extraction of anything deemed valuable by colonizers. Who not only trafficked enslaved people, goods, wealth, foreign plants, but also the idea that the world is their (or our, as I am a white woman) garden, in which they can help themselves to anything. Unjustly, in this image, only some are allowed to help themselves, and others have to to plow, to tend the garden. Cultur, craft, religious practices are part of the self-service buffet. This self image is deeply rooted and practically wears a magic hat to be invisible - that's why I didn't even notice it for a long time. All the more reason to take a closer look now. Do you have any thoughts on that?

To conclude, I want to recommend a book. This is for you if you want to work with fresh indigo: ohn Marshall's „Soulful Dyeing for All Eternity. Singing the Blues“. It's a fantastic ressource.

Dye plants in the summer garden

Collage von zwei Bildern: links ein orangeleuchtender Strauß von Schwefelkosmee, rechts ein Koerbchen voller Blüten von Ringelblume, Mädchenauge und Schwefelkosmee

What better way to start this new blog on a new website with a garden tour? This spring, when workshops were cancelled due to the pandemic, I was happy to ship many dye seeds to plant dye enthusiasts. Instead of meeting in workshops, I found myself starting dye seeds at home and share the process on stories at Instagram. The whole process is saved in the highlights. And this is what became of the tiny plants!

Blue: Indigo bearing plants

Dyer's knotweed or Japanese indigo, Polygonum tinctorum,and woad, Isatis tinctoriatwo very different plants, both contain precious indigo. The woad plants, first damaged by hail in June, now nibbled on, is still smaller than last year at this time. I already was able to have a first little harvest from Japanese indigo, mainly to encourage the plants to grow back more and bushier.
I'm curious to watch their development this year, because after two very warm summers it has been quite cool and windy a lot of the time this year, not ideal conditions for this plant. Woad, too, contains most indigo when it's exposed to lots of sunshine.

Flowers for dyeing

So my indigo harvest so far was very modest. I hope it will be sunnier again soon and more will follow! In the meantime, however, harvesting of the flowering dye plants has begun - dyer's marigold, Tagetes erecta (two different varieties this year), bright orange cosmos, Cosmos sulphureus, and delicate tickseed, Coreopsis tinctoria.

...and pot marigold, Calendula officinalis, these flowers can also be used for dyeing. But I prefer to make oil extracts from them.

The two yellow dye plants have struggled a bit so far: Weld, Reseda luteola, and dyer's chamomile, Anthemis tinctoria. I did get to harvest a bit of both, but don't expect much more. Many a weld plant did simply dissapear over night, and I'm not sure who snacks on them. Only a handful of plants survived, but I'm determined to try again next year.

The chamomile plants from last year in particular have already bloomed profusely, and then some just died within a few days, heavily infested with aphids. I usually rely on beneficial insects like the ladybug larvae and time to fix issues like that, but this time they weren't fast enough it seems. Crossing my fingers the plants that made it through will recover!

Red dyes in the garden

And lastly, madder, Rubia tinctorum. There might finally be a harvest here at the end of summer, though I got so attached to the plant that I'm not sure I'll actually do it! This is the only one of the plants that I grow for dyeing that stores the coveted dye in the roots. Harvesting is recommended only from the third year. By then the roots are nice and thick.
If you have them in your garden, you could also carefully dig out some roots from under the plant for small tests, but I never did.
The older madder plants are starting to set flowers right now – from many flowers usually get a handful of seeds, and suspect someone nibbles on them when they're young!