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Hypericum calycinum
Hypericum calycinum

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Zone
Zones 2B, 3-24, 31-34
Full SunPartial Sun
Full, Partial
Regular Water
Moderate

Hypericum calycinum

St. Johnswort
Hypericaceae
Evergreen, Ground covers, Shrubs, Semi-evergreen

HYPERICUM

All bear single flowers with prominent sunburst of stamens in center. Shal­lowly cup-shaped, five-petaled blooms range in color from creamy yellow to gold; flowers may be solitary or in clusters. Neat, fresh green foliage. Various species used for mass plantings, ground covers, informal hedges, borders. Grow especially well in mild, moist regions.

A difficult-to-control rust is extensively infecting plantings (especially those of the species H. calycinum) in the Pacific North­west. Remove and destroy blighted leaves and any leaf litter; avoid overhead watering of plants in the evening.

Hypericum calycinum
Hypericum calycinum

Click to Enlarge

Hypericum calycinum

Evergreen to semievergreen shrub from Bulgaria, Turkey. Grows to 1 ft. high and spreads by vigorous underground stems. Short-stalked leaves to 4 in. long are medium green in sun, yellow green in shade. Bright yellow blossoms about 3 in. across throughout summer. Plant tops may be killed in cold winters, but will come back in spring.

This tough, dense ground cover competes successfully with tree roots and tolerates poor soil. Fast growing; will control erosion on hillsides. May invade other plantings unless confined.

Plant from flats or as rooted stems; set 1 1/2 ft. apart. Clip or mow yearly during dormant season.

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