Hypericum tetrapterum, commonly known as Square-stalked St. John's Wort, is a herbaceous perennial plant that belongs to the Hypericaceae family. It is native to Europe and is known for its attractive flowers and unique square stems. Here's a detailed description and care guide for Hypericum tetrapterum:
Description:
Hypericum tetrapterum is a clump-forming plant that typically reaches a height of 1-3 feet (30-90 cm) and spreads moderately. It has erect, square stems that are characteristic of the Hypericum genus. The leaves are opposite, oblong to lance-shaped, and have a glossy texture. They are typically dark green in color and may have tiny translucent glands. From mid-summer to early autumn, Hypericum tetrapterum produces showy, yellow flowers with five petals and numerous prominent stamens. The flowers have a slightly star-shaped appearance and attract bees and butterflies. After flowering, small fruits with four wings (hence the name tetrapterum) may form. Hypericum tetrapterum adds a bright and cheerful touch to garden borders, wildflower gardens, or naturalized areas.
Care Guide:
Lighting: Hypericum tetrapterum thrives in full sun to partial shade. It prefers a location with at least 4-6 hours of direct sunlight per day. However, it can tolerate some shade, especially in hotter regions. Insufficient light may result in weaker growth and reduced flowering.
Water: Hypericum tetrapterum is adaptable to a range of soil moisture conditions. It prefers moderately moist soil but can tolerate short periods of drought once established. Water the plant deeply when the top inch of soil feels dry to the touch. Avoid overwatering, as it can lead to root rot.
Soil: Hypericum tetrapterum prefers well-draining soil with a slightly acidic to neutral pH. It can grow in various soil types, including loam, clay, or sandy soil. Incorporating organic matter, such as compost or well-rotted manure, into the soil can improve its fertility and moisture retention capabilities.
Temperature: Hypericum tetrapterum is hardy in USDA hardiness zones 4-8. It can tolerate a range of temperatures but generally prefers moderate conditions. It is adapted to cooler climates and may struggle in extremely hot and humid environments. Protect the plant from strong winds, as it has delicate stems.
Fertilizer: Hypericum tetrapterum generally does not require heavy fertilization. It can obtain nutrients from the surrounding soil. However, incorporating a balanced, slow-release fertilizer into the soil in early spring can provide additional nutrients. Follow the manufacturer's instructions for dosage and application methods.
Maintenance: Hypericum tetrapterum is a low-maintenance plant. Regular maintenance involves removing any dead or yellowed stems or foliage to maintain a tidy appearance. After flowering, you can trim back the plant to encourage bushier growth and potentially a second flush of blooms.
Propagation: Hypericum tetrapterum can be propagated through division or by taking softwood stem cuttings in early summer. Division is best done in spring or autumn. Carefully separate the clumps, ensuring each division has healthy roots and stems, and replant them in suitable soil. Stem cuttings can be taken from non-flowering shoots, treated with rooting hormone, and rooted in a moist potting mix.
Pests and Diseases: Hypericum tetrapterum is generally resistant to pests and diseases. However, it may occasionally attract aphids or be susceptible to foliar diseases if growing conditions are unfavorable. Monitor the plant for any signs of pests or diseases and take appropriate measures if necessary.
By following these care guidelines, you can enjoy the vibrant and attractive flowers of Hypericum tetrapterum in your garden borders, wildflower gardens, or naturalized areas. Adjust the care routine based on your specific growing conditions and monitor the plant for any signs of stress, pests, or diseases. With proper care, Hypericum tetrapterum can provide a cheerful and long-lasting display, adding beauty and interest to your outdoor spaces.
