Rain Garden Plants: Threadleaf Bluestar

Long-lived plant with very fine, feathery foliage that turns golden in the fall. Clusters of steel-blue flowers bloom in May and June. Slender, elongated seed pods develop in late summer. Forms clumps and is best when massed or used as a border. It can be cut back in the spring for denser growth. Good nectar source for butterflies. Tolerant of poor soil and some drought. Has no insect pest problems.

Height: 36 inches
Bloom color: Light blue to almost white
Bloom time: April to May
Hardiness zone: 4 to 9
Salt tolerance: N/A
Spreading habit: Self-seeds; upright, bushy mounds

Site Conditions

Sun: Sun/partial shade
Soil: Alkaline, moist, well-drained
Hydrologic zones: Moist/dry; occasional flooding

Source

The Morton Arboretum

Prepared by Jessica Chou, Jodi Sulpizio, and Constance Schmotzer.