Hypericum sampsonii

Hypericum sampsonii is a perennial in the Hypericaceae family. Its native range spans central and southern China, Taiwan, and southern Japan. It also reaches northern Myanmar and northern Vietnam. Kew places it in the temperate biome. It is not native to Britain or Ireland. In China, it grows on rough slopes and beside roads. Other habitats include thickets, stream banks, grassland, and field edges.

Plants reach about 2 feet (0.6 metres) in height. The evidence gives no mature spread or species-level leaf details. Plants For A Future lists it for cultivated beds. Flowers appear from July to August. Each flower has both male and female organs. Insects pollinate the flowers, and the plant is self-fertile. Seeds ripen from August through October. The supplied sources give no species-level account of fruit shape or colour.

Grow this plant in soil that drains well but holds moisture. It accepts sandy, loamy, and clay soils. Mildly acid, neutral, and mildly alkaline soils all suit it. It grows in sun or light shade. A sunny site gives better flowering. Plants For A Future describes it as easy to grow. That source lists USDA zones 8–11, but warns about British winters. Outdoor growth may succeed in the milder parts of Britain. Its need for moist soil should guide the choice of site.

Sow seed in a greenhouse during spring. At 50°F (10°C), germination takes one to three months. Move seedlings into separate pots once they can be handled. Keep them under glass through their first winter. Plant them outside after the last expected frost. Late spring or early summer suits this step. Spring division offers another way to raise plants. Large divisions can go straight into their final sites. Pot up small divisions until they root well under cover.

Young leaves and shoot tips have reported food uses. Plants For A Future gives edibility a low rating. It also records traditional uses for pain and intestinal worms. Other reported uses affect blood clotting and menstrual flow. These records do not establish safe or effective treatment. The same source warns of possible harm to a fetus. Avoid treating the edible listing as proof of safety. The supplied evidence names no specific pests or diseases.