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Hypericum calycinum
Hypericum calycinum

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Zone
Zones 2B, 3-24, 31-34, 39
Full SunPartial Sun
Full, Partial
Regular Water
Moderate

Hypericum frondosum

St. Johnswort
Hypericaceae
Deciduous, Evergreen, Shrubs

HYPERICUM

All bear single flowers with a prominent sunburst of stamens in the 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 are used for mass plantings, groundcovers, informal hedges, or 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 frondosum ‘Sunburst’ (photo courtesy of Bailey Nurseries, Inc.)
Hypericum frondosum ‘Sunburst’ (photo courtesy of Bailey Nurseries, Inc.)

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Hypericum frondosum

Native to the southeastern United States. This shrub is everygreen in mild climates, deciduous where winters are cold. It grows 1–3 ft. tall, with a mounding form. Blue-green leaves set off clusters of 1 1/2-in., bright yellow flowers that bloom from midsummer to early fall.

‘Sunburst’ forms a tight mound to 3 ft. high and wide.

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