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.