When planting larkspur, make sure you choose well-drained soil. ... For the best blooms, plant larkspur in full sun. Although plants can handle a small amount of shade, they are more likely to flop and require stakes.

How do you support a larkspur plant?

If you don't want them to reseed themselves, remove spent flowers before their seeds develop. Taller racemes (stalks) might need staking in unsheltered areas. Once a week for the first few weeks after your larkspurs emerge, feed them a diluted solution (about 25%) of all-purpose, 10-10-10 fertilizer.

Should I pinch back larkspur?

Do not pinch campanula, cockscomb, delphinium, dill, stock, larkspur and most sunflowers. Do pinch annuals such as coleus, impatiens, salvia, most snapdragons and petunias early in the season to encourage bushing and spreading.