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PlantSnap
Plant Care
Giant st. john's wort
(Hypericum ascyron gebleri)
Also Known As
Giant st. john's wort, Great st. john's-wort, Large st. john's wort
About This Plant
Hypericum ascyron gebleri is a herbaceous perennial plant that belongs to the Hypericaceae family. It has a single stem that can grow up to 6 feet (1.8 meters) tall and produces yellow flowers in mid to late summer. The leaves are ovate and can grow up to 6 inches (15 cm) long.
Plant Care Instructions
Outdoor Size Range
Height: 4-6 feet (1.2-1.8 meters); Spread: 2-4 feet (0.6-1.2 meters)
Light Requirements
Gebler's St. John's Wort requires full sun to partial shade. It prefers at least 6 hours of direct sunlight per day.
Humidity Needs
It prefers moderate humidity levels of around 40-60%.
Fertilizing Schedule
Feed Gebler's St. John's Wort with a balanced fertilizer once a month during the growing season.
Pruning Guidelines
Prune back the plant in early spring to encourage bushier growth and remove any dead or damaged stems.
Common Pests and Diseases
Gebler's St. John's Wort is relatively pest-resistant, but it can be affected by spider mites, aphids, and whiteflies.
Indoor Size Range
Not suitable for indoor growth
Watering Schedule
It prefers well-draining soil that is kept consistently moist but not waterlogged. Water regularly during the growing season and reduce watering in winter.
Temperature Range
It can tolerate a wide range of temperatures, but it prefers temperatures between 68-86°F (20-30°C).
Growing Season
Gebler's St. John's Wort grows in the summer months from June to August.
Growing Difficulty Level
Gebler's St. John's Wort is relatively easy to grow, but it requires consistent moisture and regular fertilization to thrive.
USDA Hardiness Zones
Gebler's St. John's Wort is hardy in USDA zones 4-8.
Did You Know?
The name 'St. John's Wort' comes from the fact that the plant flowers around the time of St. John's Day on June 24th.
