How to Grow Echinacea. There are two kinds of echinacea that are used by herbalists: Echinacea purpurea and Echinacea angustafolia. This is a fairly popular garden flower (purple coneflower) so you might find a plant at your local garden center. Just check the label for the botanical name to make sure it’s one of the two varieties mentioned above. Use a large pot (10 gallon) for this plant as it spreads from the root out, producing new shoots. Later on, you can take some new shoots that have roots attached and replant them elsewhere. If you start from seed, be patient. It can take a month to germinate and up to a year to get strong and big enough to produce flowers. The leaves can be harvested and dried for a tea but the root has the strongest properties. If you harvest the root, cut it up and dry it in a shallow cardboard box. Use it to make tea.