How to Grow Hypericum acmosepalum
Hypericum acmosepalum
Hypericum acmosepalum
shrubHypericum acmosepalum, commonly known as Yunnan St. John's Wort or needle-sepaled St. John's Wort, is a semi-evergreen to deciduous shrub native to southwestern China. It produces delicate yellow flowers followed by ornamental red berries that persist into winter. This hardy, low-maintenance shrub is valued for its extended season of interest and attractive foliage.
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Example Hypericum acmosepalum timeline · Pittsburgh, PA (Zone 6b)
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Plant Hypericum acmosepalum
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Hypericum acmosepalum
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 6-9 are ideal; can survive zone 5b with protection
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Get my Hypericum acmosepalum timeline →Growth Stages
Establishment
3-6 monthsNew transplant with initial shoot growth and root development
Water regularly to keep soil moist but not soggy. Mulch around base to retain moisture and regulate soil temperature. Provide shelter from harsh winds in first year.
Vegetative Growth
Spring through early summer, 6-8 weeksLeafy shoots develop, plant becomes bushier with increasing branch structure
Prune lightly in early spring to shape and encourage branching. Remove any dead or weak wood. Continue regular watering during dry spells.
Flowering
Mid-summer through early fall, 6-10 weeksSmall, bright yellow five-petaled flowers appear at branch tips
Do not deadhead flowers if fruit production is desired. Fertilize lightly with balanced fertilizer to support blooming. Maintain consistent moisture.
Fruiting & Maturation
Late summer through fall, 8-12 weeksFlowers fade and are replaced by developing berries that transition from green to bright red
Allow fruits to develop fully for maximum ornamental value and bird appeal. Reduce watering slightly as season cools. Avoid excessive nitrogen fertilizing.
Winter Dormancy
November through March, 4-5 monthsFoliage may persist or drop; red berries remain on branches through winter
Minimal watering required. In zone 5b, provide mulch protection or burlap wrap during severe cold. No pruning needed; berries provide winter interest.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity with foliar misting; use insecticidal soap or neem oil in severe cases. Spray undersides of leaves thoroughly.
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Hand-pick beetles in early morning; use pheromone traps nearby to draw beetles away. Insecticidal soap or neem oil for heavy infestations.
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Ensure good air circulation; avoid overhead watering. Remove infected leaves. Fungicide spray may be necessary in humid climates; thin plant to improve airflow.
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Improve air circulation through pruning. Apply sulfur dust or fungicide in dry, cool seasons when mildew appears.
Uses
Garden Display and Seasonal Interest
OrnamentalHypericum acmosepalum provides extended ornamental value with bright yellow summer flowers followed by vibrant red berries that persist well into winter, making it an excellent choice for mixed borders, hedges, and wildlife gardens. [source]
Bird Food and Habitat
WildlifeThe red berries are attractive to birds and provide essential winter food when other sources are scarce. The dense branching structure offers shelter and nesting opportunities for various bird species. [source]
Fresh and Dried Cut Arrangements
CraftStems with flowers and berries make excellent additions to fresh summer arrangements and can be dried for long-lasting autumn and winter displays. [source]
Traditional Herbal Uses
MedicinalLike other Hypericum species, H. acmosepalum has been used in traditional Chinese medicine (native to Yunnan province) for mood support and to address minor inflammatory conditions, though scientific evidence remains limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Hypericum acmosepalum is grown for ornamental value rather than harvest. Cut fresh stems with flowers or fruiting branches for arrangements in mid-summer through fall. Allow berries to remain on plant for winter interest and bird food; they persist longest if left unpruned.
Fun Facts
- 🌱 Hypericum acmosepalum is native to the mountainous regions of Yunnan Province in southwestern China, where it grows at moderate to high elevations in woodland margins and scrubland.
- 🌱 The genus Hypericum contains over 500 species worldwide and has been used medicinally for thousands of years; H. acmosepalum is one of the most ornamentally valuable species for temperate gardens.
- 🌱 The red berries can persist on branches through winter and into early spring, often remaining colorful even after snow and freeze-thaw cycles, making it exceptionally valuable for winter garden design.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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