Plants and mushrooms can be used to dye fabric. The key is knowing what botanical matter creates which colors with or without mordants. Using a mordant fixes the dye to fabric so that it doesn’t come out in the wash or fade in sunlight. Without using a mordant you can stain the material but it isn’t truly dyed. Your results also depend on the material you want to dye: ceullose or protein. Cotton, linen, or flax vs. wool. Dyeing with botanicals is a mixture of chemistry and art. You can tie dye using botancials too!
The U.S. Forest Service has a wonderful introduction to Wild Flower Native Plant Dyes with an emphasis on plants found in America. Collecting or growing your own dye material is an excellent reason to explore the outdoors.
If dyeing with botancials is soemthing you like to try I have things like onion skin (yellow & red), acorns, Calendula, St. John’s Wort, Willow, Coreopsis, Iris Root, Red Clover, and other dye materials for sale. Contact me for details.
Expand your options with iron water. It shifts or “saddens” colours as they say. While you’re at it check out shiboria, a Japanese technique. It’ll keep you busy for awhile.