Hypericum attenuatum

Hypericum attenuatum belongs to the Hypericaceae family. It is a perennial, which means it lives for years. It grows to about 2 feet [0.6 metres] tall. Its native range lies in temperate Asia. Plants For A Future lists China, Japan, Korea, and Mongolia. Its full account lists parts of eastern Russia too. The RHS notes that it is not native to Britain or Ireland.

In the wild, this plant grows in several kinds of places. It grows in dry woods, scrub, fields, pastures, and open grassland. It also grows on dry, stony slopes and pebble shores. It lives at forest edges and in clearings too. Records place it from sea level up into the mountains. These records show where it grows in the wild. They do not show a tested range of garden hardiness.

Plants For A Future says it flowers from July to September. Its seeds ripen from August through October. Each flower has both male and female organs. Insects carry pollen to pollinate the flowers. The supplied species account does not state the flower colour. It gives no leaf details or mature width. Nor does it describe the fruit in detail. The RHS gives broader flower and leaf traits for the genus. It does not give those traits for this species.

The species account says sandy, loamy, and clay soils suit it. Soil must drain well, but can be dry or moist. The stated pH range is mildly acid to mildly alkaline. The plant can grow in full sun or partial shade. Suggested garden sites include sunny woodland edges and spots with dappled shade. The source is unsure how well it withstands British cold. Based on its range, the author expects outdoor success in many British areas. This does not establish a hardiness zone. The fuller growing notes draw on the whole genus.

Plants For A Future describes seed sowing and division in spring. Its seed method uses a light cover in a greenhouse. The guide keeps young plants under cover for their first winter. It moves them outside after the expected last frost. Records note cooked leaves as food in times of famine. This is an emergency use, not a claim of routine food value. The source lists no known medicinal or other uses. It reports no known hazards, but this does not prove safety. It gives no pest or disease account for this species.