I’ve been doing natural dyeing for a long time, and was always exasperated about the absence of a good plant source for the color green. Paradoxical, isn’t it? But the green coloration in plants is due to the presence of chlorophyll. In fall, the chlorophyll ceases production and gradually disappears, leaving the leaf’s true color to show. Once, while making a dye with fern fiddleheads, the only plant material available that early spring day, I discovered to my dismay that I’d left my brass kettle at home. Had to make do with the iron one, and had a pleasant surprise. The result was a lovely, soft gray-green.
But fiddleheads are around for just a short time every year. I needed a source available in the summer. Comfrey to the rescue. This plant has many advantages, the primary one being the size and abundance of its leaves. Making comfrey dye is easy: Simmer the leaves, about a grocery bag full, in about a gallon of water for about 1/2 hour, then remove the plant material. Submerge wet, alum mordanted wool into the bath and simmer in an iron container for another 1/2 hour or so. Olive green should be the result.
Using brass, glass, stainless steel containers will not yield the same results; probably a watery yellow will emerge, but who knows? Natural dyeing is more art than science.
Comfrey in New England is a perennial known for its abundant proliferation. Its tiny flowers start to blossom in June, but the flowers aren’t used for dyeing. Medicinally, comfrey has been used to treat bruises, sores, broken bones, hemorrhoids ( there they are again), gout and joint pain. It used to be eaten in salads and tonics but has been found to cause liver damage.