Ask Mr. Smarty Plants

Looks like your Liatris spicata (dense blazing star) has experienced a double case of transplant shock. The first time, a small "start" might have needed a little more shade right at first, and clay soil does not drain well, which this plant needs. So, transplanting it to the pot probably was a good idea, but it might have just been too much all at once. It is native to the Eastern United States, so it should be fine in Washington, DC; hopefully, it just needs some first aid. To begin with, move that pot into an area where it will get morning sun and not so much afternoon sun, at least at first. Then, trim off about one-half to one-third of the upper structure of the plant, leaving still-vigorous green leaves on the lower part, in order to provide nutrition for the plant. Don't fertilize until the plant has recovered. Keep the soil in the pot moist but, again, make sure it is draining well. This plant is found naturally in moist woodland openings, and marsh edges so you need to try to emulate those conditions. It will tolerate dryness more when it is established. You may not get much in blooms this year, but since it grows from a bulb that will possibly help to carry it over and be more vital next year. This article from North Carolina State University Extension can give you more information.

Liatris spicata

Liatris spicata

Liatris spicata