Hypericum kalmianum Colbalt-n-Gold™ (Kalm St. Johnswort)
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Colbalt-n-Gold Kalm St. Johnswort is a small, cheerful, decorative shrub.
The small flowers cover the shrub in June and look good on top of the gray-green leaves.
Everything about this plant is cute - the small stature, the button-like flowers (albeit the showy yellow stamens would make them spiky awkward buttons), and the petite leaves.
Colbalt-n-Gold likes to spread wider than it grows high and we like to plant groups (in groups of odd numbers) or tuck in empty spaces one-at-a-time. It looks proper at the base of taller, leggier shrubs and it look like it belongs mixed in with perennials. It's like one of those kids who can talk to anybody in the class or a person of any age - they're not pigeonholed in one social group - a quality I admire.
small native shrub for sunny, dryish locations
bright yellow flowers, yes, that's nice for 2-3 weeks, but the gray-green foliage looks great throughout the growing season
that leaf color, plus the small leaf texture, contrast in a border or foundation planting where so many other plants have broad, green leaves
heat tolerant, cold tolerant, pollinator plant
Kalm St. Johnswort, Kalm's St. Johnswort, St. Johnswort, St. John's wort
USDA Hardiness Zones
flowering shrub, deciduous
Fall: yellow, orange, red
Fall Leaf Color Quality
Native to USA?
Soil Moisture Requirements
average garden, well-drained, no standing water
Soil pH Requirements
acid, neutral, alkaline
full sun, part shade
To Make It Thrive
Give Kalm St. Johnsword well-drained soils. In the wild it grows in rocky soils so that tells you something about needing drainage. Best flowering in full sun.
Is this the medicinal St. Johnswort? No, this isn't the medicinal species, that's Hypericum perforatum and is an herbaceous perennial, while Kalm St. Johnswort is a woody shrub.