I grow many herbs that the primary part to be used is the root. I have not yet harvested any, and am looking for tips and tricks of how one goes about harvesting the roots but still keeping the plant. I assume one digs it up, chunks off however much seems reasonable, and then replants the remaining root? When is best time of year to do so? Then it seems it would take quite a long while for the root to dry enough to powder it. And how do you know its dry enough? And how do you powder it? Lots of questions, really hoping someone will chime in who has done some root harvesting and give me a step-by-step. I have marshmallow, valerian, and horseradish all healthy and mature enough to try (I think...)