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PlantSnap
Plant Care
Wavy st john's-wort
(Hypericum undulatum)
Also Known As
Wavy st john's-wort, Wavy-leaved st. john's-wort, Undulate st. john's-wort
About This Plant
Hypericum undulatum is a flowering plant species native to North America. It is a perennial herb that can grow up to 3 feet (91 cm) tall. The plant has yellow flowers that bloom in the summer and fall, and it produces small, round, reddish-brown fruits. The leaves are ovate and have a wavy or undulating margin, which gives the plant its common name.
Plant Care Instructions
Outdoor Size Range
1-3 feet (30-91 cm) tall and 1-2 feet (30-61 cm) wide
Light Requirements
Hypericum undulatum prefers full sun to partial shade. It can tolerate some shade, but too much shade can reduce flowering.
Humidity Needs
The plant has no special humidity requirements and can tolerate a wide range of humidity levels.
Fertilizing Schedule
The plant does not require much fertilizer, but a light application of a balanced fertilizer in the spring can help promote growth and flowering.
Pruning Guidelines
The plant does not require much pruning, but removing dead or damaged branches can help promote new growth and flowering.
Common Pests and Diseases
Hypericum undulatum is generally not prone to pests or diseases, but it can be susceptible to rust and leaf spot.
Indoor Size Range
Not suitable for indoor growing
Watering Schedule
The plant requires moderate watering, with the soil being kept moist but not waterlogged. It can tolerate short periods of drought.
Temperature Range
Hypericum undulatum can tolerate a wide range of temperatures, but it prefers moderate temperatures between 60-75°F (15-24°C). It can survive temperatures as low as -30°F (-34°C).
Growing Season
Hypericum undulatum grows in the summer and fall.
Growing Difficulty Level
Hypericum undulatum is relatively easy to grow, making it a good choice for beginner gardeners.
USDA Hardiness Zones
Hypericum undulatum is hardy in USDA zones 4-9.
Did You Know?
Hypericum undulatum has been used in traditional medicine to treat a variety of ailments, including depression, anxiety, and skin conditions.
