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Key characteristics

Family: Hypericaceae
Height: 12 to 18 inches
Width: 15 to 24 inches
Flower color: Bright golden yellow
Foliage color: Blue-green
Bloom time: May to July
Light: Full sun to partial shade
Water: Low; drought-tolerant
Maintenance: Low; mow to the ground every year or two in winter or early spring
Growing zone: USDA Zones 5 to 9
Wildlife: Attracts bees

Groundcovers

Hypericum calycinum

St. John's Wort

Hypericum calycinum, commonly known as St. John's wort, is a low-growing perennial native to Europe and Asia. It blooms profusely in summer, typically from May to July, producing large, showy blossoms with numerous stamens that give it a fluffy, star-like appearance. The bright yellow flowers are a standout in gardens, especially against the dark green foliage.

This cultivar is known for its colorful blooms and ability to thrive in a variety of conditions, making it a reliable choice for filling in garden beds or slopes.

Light

Full sun to partial shade

Water

Low; drought-tolerant

Bloom time

May to July

Find this plant

Works well in

Slopes & Banks
Borders
Containers
Rock Gardens

Companion plants

Lavender · Creeping phlox · Catmints · Coneflowers · Ninebark · Feather reed grasses

Design tip

Plant broad sweeps of this vigorous groundcover to stabilize slopes and soften the edges of sunny borders. Pair it with upright flowering perennials, ornamental grasses, and contrasting shrubs to create bold layers of color, texture, and natural rhythm.

Printable plant sheet (PDF)