Tuberous St. John's Wort
hypericum triquetrifolium
Also known as: ["Tuberous St. John's Wort","Trident St. John's Wort"]
Overview
A deciduous shrub with yellow flowers and distinctive three-lobed leaves, native to the Mediterranean region.
Benefits & Perks
["long-flowering","drought tolerant","wildlife attractant (bees, butterflies, birds)"]
Botanical Classification
| Phylum: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Malpighiales |
| Family: | Hypericaceae |
| Genus: | Hypericum |
| Botanical Name: | Hypericum triquetrifolium |
Plant Characteristics
Basic Information
- Category: Shrubs
- Suitable Location: rock gardens, sunny borders, or containers in full sun
- Suitable For:
- Is Weed: No
- Allergenicity: low
Environmental Needs
- Climate: {"temperatureRange":"5–35°C"}
- Hardiness: {"zones":"7–10"}
- Misting: rarely required, only if ambient humidity is very low
- Drainage: Fast-draining to prevent waterlogging.
- Soil Type: Well-draining, sandy loam with some organic matter; cactus or succulent mix works well.
Maintenance Level
- Maintenance Level: low
- Toughness Level: moderate
- Pruning Frequency: Annually in late winter or early spring before new growth begins.
- Pruning Intensity: Moderate; remove up to one-third of old growth to rejuvenate the plant.
Care Details
Ideal Sunlight Coverage:
Full sun (6–8 hours of direct sunlight daily); tolerates partial shade in intense summer heat.
Sunlight Tolerance Tips:
Acclimate plants gradually to direct sun; protect from harsh midday sun in hot climates; ensure adequate light indoors with supplemental grow lights if needed.
Care Requirements
Care Difficulty
easymoderate
Sunlight
full sun
Rotate plant for even light exposure; use sheer curtains to filter intense sun; avoid placing in dark corners.
Watering
every 7–10 days during active growth, reduce in winter
Water thoroughly but infrequently; ensure soil dries between waterings; avoid overwatering.
Soil
well-draining, sandy loam
pH: Slightly acidic to neutral (pH 6.0–7.0).
Use a mix with good aeration; avoid heavy clay soils; ensure pots have drainage holes.
Temperature
Prefers warm temperatures (65–85°F or 18–29°C); can tolerate mild frosts but thrives in heat.
Protect from frost; ensure good air circulation; adjust watering with temperature changes.
Fertilizing
every 4–6 weeks during spring and summer
Apply fertilizer after watering to prevent root burn; stop fertilizing in late fall to allow dormancy; flush soil occasionally to prevent salt buildup.
Propagation
Methods
Stem cuttings or seed; stem cuttings are more reliable for home growers.
Step-by-Step Propagation Guide
- Take 4–6 inch cuttings.
- Remove lower leaves.
- Dip in rooting hormone.
- Plant in medium.
- Keep moist and warm.
Best Time: Late spring to early summer when the plant is actively growing.
Environment
Warm (70–75°F or 21–24°C), humid, and bright but indirect light.
Medium
Well-draining mix of perlite and peat moss or cactus mix.
Hormone
Recommended to use rooting hormone for faster root development.
Timeline
Roots develop in 4–6 weeks; new growth appears in 2–3 months.
Tools Needed
Pruning shears, rooting hormone, small pots, misting spray bottle.
Quick Tips
Use healthy, non-flowering stems; maintain high humidity with a plastic cover; keep out of direct sun.
Pruning & Repotting
Pruning Guide
Method
Selective thinning and heading back to shape the plant and improve air circulation.
Pruning Plan
Prune to maintain shape, encourage bushiness, and remove dead or diseased growth.
Tools
Pruning shears, sterilizing solution, gloves.
Checklist
Sterilize tools; prune dead/damaged branches; shape the plant; clean up debris.
Repotting Guide
Best Season
Early spring before active growth starts.
Pot Size
Increase pot size by 2–3 inches in diameter; ensure good drainage.
Method
Remove plant gently; trim roots if needed; place in new pot with fresh soil; water lightly.
Suggestions
Repot every 2–3 years or when roots fill the pot; beneficial for growth and soil freshness.
Checklist
Choose appropriate pot; prepare new soil mix; handle roots carefully; water after repotting.
Advanced Care Tips
Watering Mastery
Watering Checklist
Check soil moisture; water deeply; ensure drainage; adjust for season.
How to Apply Water Properly
Water at the base of the plant, ensuring moisture reaches the root zone; allow excess water to drain away; water in the morning to reduce evaporation.
Watering Schedule Tips
Water deeply once the top inch of soil is dry; reduce frequency in winter to prevent root rot.
Soil Improvement
Add perlite or coarse sand for drainage; incorporate compost for fertility; ensure soil is loose and airy.
Temperature Stress Management
Signs of Temperature Issues
Wilting, leaf drop, or chlorosis in cold; scorching or stunted growth in excessive heat.
Cold Stress
Slows growth; may cause leaf drop or dieback in prolonged cold; susceptible to root rot in cold, wet soil.
Solution: Provide winter protection with mulch; move potted plants indoors; avoid overwatering in cold weather.
Hot Stress
Leaves may scorch or curl; growth may slow; increased water demand to prevent dehydration.
Solution: Provide afternoon shade; increase watering frequency; use mulch to retain soil moisture.
Fertilizing Guide
Fertilizing Checklist
Check fertilizer type; dilute correctly; apply during growing season; avoid winter feeding.
Fertilizing Method
Use balanced, water-soluble fertilizer diluted to half strength; fertilize every 4–6 weeks during growing season (spring to early fall); avoid fertilizing in winter.
Common Problems & Solutions
Toxicity Warning
Cats
Slightly ToxicCats may experience mild gastrointestinal upset and skin irritation if they ingest or come into prolonged contact with Hypericum triquetrifolium. The plant's toxicity is generally low but can cause discomfort.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Dogs
Slightly ToxicIn dogs, ingestion of Hypericum triquetrifolium can lead to mild gastrointestinal distress and potential phototoxicity. The plant is not highly toxic but can cause discomfort if consumed in significant quantities.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Humans
Slightly ToxicHypericum triquetrifolium contains hypericin and other bioactive compounds that can cause phototoxicity and mild gastrointestinal upset when ingested. The plant's effects are generally mild but can be more pronounced in sensitive individuals.
⚠️ Symptoms:
🌿 Toxic Parts:
⚡ Toxic If:
if eaten
Frequently Asked Questions
Q: Is Hypericum triquetrifolium toxic to pets?
A: It is mildly toxic to dogs and cats.
Q: How often should I water this plant?
A: Water moderately, allowing the soil to dry between waterings.
Q: Does it attract wildlife?
A: Yes, it attracts bees, butterflies, and birds.
Quick Reference
| Family: | Hypericaceae |
| Care: | easy |
| Light: | full sun |
| Water: | every 7–10 days during activ |
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