Shrubs

Hypericum kalmianum 'Gemo'

Gemo St. John's wort

Gemo St. John's wort. Representative plant

Slender leaves form a tidy mound topped by bright yellow flowers with prominent golden stamens. The bloom display extends from July into September, adding color after many spring shrubs finish. Use its rounded shape along a border or on a bank.

At a glance

Sun: Full sun to part shade
Mature size: 2–3 ft. tall × 2–3 ft. wide
Water: Well-drained soil
Hardiness: USDA zones 4–7
Bloom: Yellow; July–September

Sizes & prices

#2St. Johns Wort$36.99

Catalog updated September 8, 2026. This is not a live stock count; please call to confirm availability and price.

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Resistance & tolerances

Deer: Resistant, but not deer-proof.
Drought: Tolerant once established.

Resistance is not a guarantee; deer and rabbits may browse any plant.

Growing & care

Form: Compact, mounded shrub with narrow leaves.
Pruning: Little needed; remove dead, damaged or crossing shoots.

Sources & photo credits

Royal Horticultural Society

Spring Meadow Nursery

Pleasant Run Nursery

Royal Horticultural Society

www.arboretum.purdue.edu

Photo: Photo by David J. Stang · CC BY-SA 4.0

Image notes: Gemo St. John's wort. Representative plant; resized and re-encoded, not cropped.

Reviewed September 21, 2026. Growing conditions vary by location.