Photo courtesy of Spotswood Greenery
Hypericum kalmianum 'PIIHYP I' Cobalt-n-Gold™ PP25,318
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Silver-blue foliage sets off the bright yellow flowers on this one, a color combination the green-leaved forms do not offer. Hypericum kalmianum 'PIIHYP I', sold as Cobalt-n-Gold, grows 2 to 3 feet tall and 4 to 5 feet wide in full sun to part sun, hardy from Zone 4 through Zone 7.
Bloom runs from midsummer into fall, with yellow star-shaped flowers carrying a prominent boss of stamens.
The habit spreads wider than tall, which makes it useful as a low mass planting or a bank cover rather than a single specimen.
Bees work the flowers through the bloom. Kalm's St. John's wort wants full sun and well-drained soil, handles drought and poor ground once established, and dislikes wet feet. Deer leave it alone.
Height 2'- 3' Spread 4'- 5'
USDA Hardiness Zones 4-7
Lowest Temperatures -30°F to -20°F
Full sun to part sun- at least 4 hours direct sun per day
IL, IN, MI, NY, OH, WI
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