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Hypericum kalmianum

St. John's Wort

This compact, easy-to-grow shrub forms nice masses and should be placed where the bright yellow flowers show to full advantage. The flowers bloom for about 6 weeks and have a showy tuft of yellow stamens. Butterflies, bumblebees, and other pollinators love the nectar. The semi-evergreen leaves are dark blue-green all season and last into late fall.

Benefits

Great source of nectar for bumblebees and other pollinators
Showy yellow flowers for 6 weeks in summer
Good small shrub for mass planting
Thrives in hot sun and poor, rocky soils

Homeowner Growing and Maintenance Tips

Easy to grow in average, well-drained soil in full sun to part shade. Prefers moist, rich, sandy loams but tolerates poor soils and drought. If plants need pruning, cut them back to shape and reduce the size of the plant in late fall. Do not cut them back all the way to the ground.


Height
2-3 Feet

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Spread
2-3 Feet

USDA Hardiness Zone 4-7

Native Range

Dunes and rocky lake shores, common around the Great Lakes from the Ottawa River to southern Ontario, Wisconsin, and the Upper Peninsula of Michigan south to Illinois and Ohio.

Native Trivia

Bumblebees are black and yellow and hairy. They carry pollen on their hind legs to bring back to the hive. They are often found foraging at flowers and are quite docile while at work. Bumblebees are beneficial insects and have no equal when it comes to pollinating certain crops such as red clover and blueberries.


"Nectar from plants like this attracts pollinators like me and is the primary ingredient in honey."

Characteristics & Attributes

Plan Sub Group
Small Shrubs
Exposure
Filtered Shade
Sun
Soil
Well-drained
Wide soil tolerance
Soil Moisture Preference
Average
Dry
Attracts Wildlife
Beneficial insects
Butterflies
Hummingbirds
Bloom Time
Summer
Habitat Collection
Butterfly
Native Habitat
Grassland
Foliage Color
Blue-green
Uses
Drought tolerant
Edging
Erosion control
Ground cover
Hedge, screen
Mass plant
Naturalizes
Rock garden
Specimen
Native to
District of Columbia
Illinois
Indiana
Michigan
New York
Ohio
Wisconsin