Gardening Questions And Answers
Larkspur is basically an annual version of delphinium, an all-time favorite perennial. Larkspur produces lovely spikes of blue, purple, pink, or white flowers in spring and summer. They look best clustered in small patches. Like many cool-season annuals, it’s a good winter-blooming plant for the Deep South.
A hollow stem distinguishes larkspur from poisonous monkshood, which has a similar blue flower but with a hood. Low larkspur has spurred blue flowers that grow on the top third of a single and unbranched stem. It is found on grassy hillsides and in sagebrush areas, where it may reach a height of 2 feet.
Cause Several species of Pythium can rot Delphinium species as well as many other bedding and garden plants. Spread can also occur via movement of infected plants. Damaged plants are more easily infected. The disease is usually favored by cool, moist conditions in the field and wet waterlogged soils.
Most annual larkspur plants are grown from seeds, though planting larkspur seeds can be challenging. Keep in mind that larkspur seeds often will not germinate at temps above 65 F. (18 C.). Learning when to plant larkspurs that have been chilled requires knowing when the first frost date occurs in your area.