Dyeing with Fresh Plants

Q: Any general tips for dyeing with actual fresh plants?

A: I've found it is best to work with simmering liquids, no need for vigorous boils. If its a leafy green plant, I'll heat the liquid first then add the greens and simmer for 20 minutes at least. Woody or root-y things, I'll simmer for an hour, then remove the dyestuff, keep the pots hot, but on low heat and make sure to keep agitating the fabric goods.