Growing Knautia
Knautia grows best in full sun and average, well-drained soil. A loose, clump-forming plant, it tends to flop and sprawl in windy growing areas. Plant it in a protected spot, such as near an evergreen shrub or a building that will protect it from prevailing winds. Plant knautia from seed or transplants purchased at a garden center. Plant seeds in spring as soon as the soil can be worked. Like most perennials, knautia is easiest to start from transplants. After planting transplants, water them well and cover the soil around plants with a 2-inch-thick layer of mulch. Water plants regularly during the first growing season. Knautia will self-seed in optimum growing conditions. Cut back spent flowers as soon as they are noticed to prevent self-seeding if desired. Or leave spent seeds and enjoy songbird antics as birds love knautia seeds. Knautia can be divided every three or four years in early spring. As soon as the foliage emerges, sink a spade into the ground and lift the entire clump. Cut the clump into several sections and replant divisions immediately. Water divisions well.
New Types of Knautia
Plant breeders are developing new knautia plants that have stronger stems and a more upright habit. Often more compact, these small plants are well-suited for a variety of planting sites. A variety with variegated foliage has also hit the market. Check out ‘Thunder and Lightning’.
