Matted St. John's-wort (Hypericum japonicum)

Matted St. John's-wort

Also known as: Japanese St. John's wort

Matted St. John's-wort (Hypericum japonicum) is a widespread wildflower that occurs in a large variety of mainly damp tropical habitats from rice fields to grasslands. While it isn't a common ornamental species, its dense and compact growth forms make it a good candidate for ground cover. Its small yellow flowers offer up to six months of garden interest.

Scientific classification

Species

Matted St. John's-wort (Hypericum japonicum)

Nances, spurges, willows and allies

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2 cm to 5 cm

Plant Height

15 cm

Spread

4 mm to 8 mm

Flower Size

Yellow

Flower Color

Semi-evergreen

Leaf type

10 - 35 ℃

Ideal Temperature

Images of Matted St. John's-wort

Distribution of Matted St. John's-wort

Distribution Map

Matted St. John's-wort is endemic to a wide range of areas across East, South, and Southeast Asia, thriving in both temperate and tropical climates. It has been introduced and naturalized in other regions, expanding its presence beyond its native range. Matted St. John's-wort's ability to adapt has facilitated its spread, establishing it in diverse ecological zones.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Wet places in lowland, rice fields, ditches, marshes, grasslands, waste places, bog garden

Hemisphere Trend Curve

Northern

Sorthern

Care Guide for Matted St. John's-wort

Every week

Water

Full sun

Sunlight

10 - 35 ℃

Ideal Temperature

Water: Matted St. John's-wort thrives in wet environments, preferring humidity and tolerating high moisture. It requires weekly watering to maintain health. As an herbaceous perennial, matted St. John's-wort grows best in moist soils, making it ideal for container gardening where water levels can be easily managed.

Fertilize: For matted St. John's-wort, use balanced nutrition fertilizers for health and high-nitrogen varieties for growth, especially in spring and summer. Fertilize monthly then bi-monthly in fall; stop in winter. Follow package instructions carefully to avoid harm and stress, especially for potted plants or varying soil conditions.

Pruning: Matted St. John's-wort flourishes with proper spring pruning, enhancing growth and blooms. Trim old stems to encourage new growth, and regular thinning prevents overcrowding and disease. Use clean, sharp tools for best results, promoting a compact, robust form.

Propagation: Matted St. John's-wort is a perennial herb known for its medicinal properties and bright yellow flowers. It prefers well-drained soil and moderate sunlight. Propagation is done through sowing seeds in a peat-sand mix, keeping consistent moisture for successful germination while avoiding overwatering.

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Learn More About Matted St. John's-wort

Sunlight Requirements

How to Transplant

How to Prune

How to Grow and Care

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