Botanical Name
Aconitum
Hardiness
Zones 3 to 7
Height
3 to 4 feet
Width
12 to 18 inches
Flowers
Mid to late summer: blue, violet
Light
Full sun to part shade (ideal)
Soil
Moist, well-drained (prefers soils that are kept moist but not wet, especiall in full sun)
Planting and Care
Dig and divide in spring or fall, though this plant can be left in the garden for many years before that becomes necessary. Prefers moist, but not soggy soils. Aconitum is poisonous and care should be taken when transplanting, do not plant near vegetable gardens. Some taller varieties may need staking.
Problems
Crown rot, verticillium wilt, bacterial leaf spot, powdery mildew, rust
Varieties to Consider
'Albus' - white flowers, 3-4' tall
'Bicolor' - blue and white flowers, 3-4' tall
'Newry Blue' - navy blue flowers, 4-5' tall