When planting them, make sure to give plenty of space to be able to dig those roots out in the future without disturbing other plants in the process.
Echinacea, astragalus, elecampane ( Inula helenium), licorice ( Glycyrrhiza glabra), and ashwagandha ( Withania somnifera) are some popular herbs whose roots carry the most medicine rather than their above-ground parts. When planting them, make sure to give plenty of space to be able to dig those roots out in the future without disturbing other plants in the process. I learned this the hard way. The first time I planted echinacea, I had yarrow growing all around it, hugging it close. I couldn’t get to the roots of the echinacea without sacrificing some of my yarrow plants! In the end it turned out OK, as I just dug up the yarrow too and shared it with friends. Hindsight is 20/20 and so I’m sharing mine with you so (hopefully) you don’t have to make the same mistakes!