Gemo St. John's Wort

Hypericum kalmianum 'Gemo'

Popular for its prolonged bloom period and refined foliage, this Danish introduction has small, bright yellow flowers and blooms profusely from July to September. A neat, bushy shrub with attractive bright green, willow-shaped leaves, ideal for massing as a low informal hedge or mounding groundcover. Deciduous.
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Full sun, Partial sun

Water regularly - weekly, or more often in extreme heat.


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Botanical Pronunciationhi-PER-i-kum kal-mee-AH-num
Average Size at MaturityModerate growing; reaches 2 to 3 ft. tall and wide.
Bloom TimeMidsummer to Late Summer
Design IdeasExcellent used in large groupings as a mounding groundcover or a low, informal hedge.
Deciduous/ EvergreenDeciduous
Flower AttributeFlowers for Cutting, Long Bloom Season, Showy Flowers
Flower ColorYellow
Foliage ColorGreen
Garden StyleCottage, Rustic
Growth HabitRound
Growth RateModerate
Landscape UseBorder, Firescaping/Fire Wise, Hedge, Mass Planting, Woodland Garden, Cutting Garden, Ground Cover
Light NeedsFull sun, Partial sun
Soil NeedsAll-Purpose Plant Food
Special FeatureEasy Care, Tolerates Acidic Soil, Tolerates Poor Soils, Waterwise, Compact Form, Tolerates Road Salt
Water NeedsModerate
Watering NeedsWater regularly - weekly, or more often in extreme heat.
Companion PlantsConeflower (Echinacea); Rose (Rosa); Sedum (Sedum); Spirea (Spiraea); Daylily (Hemerocallis)

Provide enriched, neutral to acidic, moist, well-drained soil; avoid soggy, poorly drained soils. Water deeply, regularly during the first growing season to establish an extensive root system. Once established, reduce frequency; tolerates mild drought. Apply fertilizer in early spring. Prune annually after flowering to shape.

This Plant's Growing Zones: 5-9

Your USDA Cold Hardiness Zone:

Your climate may be too cold for this plant