Care
Apply a thin layer of compost each spring, followed by a 2-inch layer of mulch to retain moisture and control weeds. Water plants during the summer if rainfall is less than 1 inch per week. Stake tall varieties to keep them upright. Remove the central flower spike after flowering to encourage other side shoots to form and produce more flowers. However, if you want the plant to self-sow and multiply, leave the flower spike intact on the plant so seeds can mature and disperse.