Great St. John’swort

Botanical Name: Hypericum ascyron

Height: Tall

Season of bloom: Summer

Growing Conditions: Full sun to part sun. Moist soil.

Wildlife benefits: Constantly a-buzz with large and small bumblebees. The caterpillars of the Gray Hairstreak butterfly feed on the developing capsules and seeds.

From Ottawa Valley or eastern Ontario sources:

Remarks: Flowers last only a day, but many buds mean plant is in bloom for several weeks. Not usually eaten by deer.

Similar species: Quite different from other native St. John’sworts, but see also Kalm’s St. John’swort.

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Hypericum ascyron