Life Cycle
Perennial
Plant Characteristics
Evergreen foliage
Growth Habit
Spreading
Bloom Season
Late spring
Flavour Profile
Ornamental landscaping
Suitable for
Outdoor
Seed Type
Open-pollinated seeds
Plant Type
Evergreen shrub
Planting Season
Spring
Fruit Size
N/A
Plant Height
12–24 inches
Light Requirement
Full sun
Water Needs
moderate
Hardiness Zones
5–9
Container Garden
Yes
Plant Spacing
18–24 inches
Planting Depth
Surface sow
Growing Conditions
Well-drained soil
Frequently Asked Questions
Can Hypericum calycinum grow beneath trees where grass struggles?
Can Hypericum calycinum grow beneath trees where grass struggles?
Yes. It tolerates partial to full shade and is commonly used as a ground cover beneath trees where many grasses grow poorly.
Will Hypericum calycinum spread to cover bare soil?
Will Hypericum calycinum spread to cover bare soil?
Yes. It spreads through underground stems, gradually forming a dense carpet that helps cover open areas and stabilize soil.
Do the bright yellow flowers appear throughout summer?
Do the bright yellow flowers appear throughout summer?
Yes. The plant typically produces large golden-yellow blooms during summer, adding long-lasting seasonal color.
Can Hypericum calycinum help reduce soil erosion on slopes?
Can Hypericum calycinum help reduce soil erosion on slopes?
Yes. Its spreading growth habit makes it useful for covering banks, slopes, and embankments where erosion control is needed.
Should established plants be trimmed occasionally?
Should established plants be trimmed occasionally?
Yes. Shearing or mowing every few years encourages fresh growth and helps keep the ground cover neat and vigorous.
Is Hypericum calycinum grown mainly as an ornamental ground cover rather than a medicinal herb?
Is Hypericum calycinum grown mainly as an ornamental ground cover rather than a medicinal herb?
Yes. This species is primarily cultivated for landscaping and ground cover and should not be confused with medicinal St. John's Wort species.