Shrubby St. Johnswort
Hypericum prolificum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Shrub
Height
48 inches
Width
48 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8
Water
Low to moderate
Humidity
Adaptable
Lifespan
Long-lived deciduous shrub
Native To
Eastern North America
Toxicity
Mildly toxic if ingested
The Story
Plant Bio
Hypericum prolificum is a dense, mounding, deciduous shrub native to eastern and central North America, known for its profuse, bright yellow summer flowers. This species is exceptionally adaptable and low-maintenance, thriving in a wide range of soils and conditions while providing a long season of cheerful color and attracting pollinators.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Choose a location with full sun to part shade and well-drained soil.
- Dig a hole twice as wide as the root ball and just as deep.
- Gently loosen the roots and place the plant in the hole.
- Ensure the top of the root ball is level with the ground.
- Backfill with soil, firming gently around the base.
- Water thoroughly after planting and mulch to retain moisture.
Pro Tip
For the best flowering and densest form, provide at least six hours of direct sun daily.
Keep It Thriving
Care Guide
Do
- Water regularly during the first year to establish a strong root system.
- Prune back by about one-third in early spring to encourage bushy growth.
- Allow soil to dry out between waterings once established.
- Plant in groups for a stunning massed effect.
Don't
- Don't plant in poorly drained, constantly wet soil to avoid root rot.
- Avoid heavy fertilization, which can lead to weak, leggy growth.
- Don't shear into a formal shape; allow its natural mounding habit.
- Avoid overhead watering to minimize the risk of fungal diseases.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mulch | ||||||||||||
| Plant | ||||||||||||
| Prune |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Shrubby St. Johnswort questions
What zones can Shrubby St. Johnswort grow in?
Shrubby St. Johnswort is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Shrubby St. Johnswort deer resistant?
Yes — Shrubby St. Johnswort is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Shrubby St. Johnswort bloom?
Shrubby St. Johnswort typically blooms in early summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Shrubby St. Johnswort need full sun?
Shrubby St. Johnswort does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Shrubby St. Johnswort drought tolerant?
Yes — once established (usually after the first full season), Shrubby St. Johnswort handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Hypericum to compare
Hypericum frondosum Goldmound
Hypericum frondosum
Great St. John's Wort
Hypericum ascyron
Variegated Hypericum
Hypericum patulum 'Hidcote Variegated'
Kalm's St. John's Wort
Hypericum perforatum 'Sunny Boulevard'
Kalm's St. John's Wort
Hypericum kalmianum
Gemo St. Johnswort
Hypericum kalmianum 'Gemo'
Keep exploring
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Grow Shrubby St. Johnswort with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
