Hypericum ascyron

Product Info

Great St. John's-wort (Hypericum ascyron)
St. John's Wort Family

This St. John's-wort stands out for its height and large, showy flowers. It is herbaceous, rather than woody like many of the genus, and can reach heights of 6'. Two inch, bright yellow flowers are born on top of the stem in small clusters in late summer. Flowering time is somewhat short, but the blue-green foliage, and large seed heads remain an attractive feature in the garden. It can tolerate a wide variety of sun and soil types, but is naturally found low lying wet place in part sun. It attracts mainly bumblebees, and is a host plant to several species of moths and butterflies. Try planting with River Oats, New York Ironweed, Rose Milkweed, Switchgrass, and Blazing Stars.

Blooms: Yellow, 3-4 weeks, July-August
Leaves: Blue-green, lance shaped, red tones in winter
Height:4-6’ 
Space: 2-3’
Soil: Average-Moist
Exposure:  Full sun-Part sun
Seeds: Cone-shaped seeds heads are large, very attractive--turn from yellow to red to brown
Fauna: Bees, flies, wasps, beetles, butterfly and moth host plant
Deer Resistance: High
Zone:3-7
Native Status: Northeast/Midwest native
Provenance: PA, seed grown