Lactuca formosana

Lactuca formosana is in the daisy family, Asteraceae. Kew gives its native range as China to Taiwan. The sources say little about where it grows wild. Plants For A Future does not name its wild habitat. Nor does it say how long the plant lives. It may be annual, living for just one year. It may be perennial, living for more than two years. The source cannot confirm which is true. The evidence gives no height or spread figures. These gaps leave its garden form unclear.

The flowers have both male and female organs. Plants For A Future says insects pollinate the flowers. The sources give no bloom months or flower colour. They give no details of fruit, stems or leaf shape. Only the leaves have a listed food use. The source says people cook them for food in times of shortage. It gives this plant a low food-use score: one out of five. This means a small food role, not a standard crop grown as a vegetable.

Plants For A Future lists sand and loam as suitable soils. It says the soil should stay moist but drain well. The stated pH range is mildly acid to mildly alkaline. The plant can grow in sun or light shade. The source lists woodland edges and patches of shade. These are possible garden sites, not a known wild habitat. How well it copes with British cold remains unclear. The source gives no confirmed hardiness zone. Its wider notes on growing draw on the genus. They do not reflect tested needs for this species.

To grow new plants, the source says to sow seed outdoors in spring. Cover the seed with a thin layer of soil. It says the seeds tend to sprout fast. The advice gives no supported growth rate or full-grown size. Plants For A Future records no weed risk for this species. It lists no other uses or details of pests or disease. It gives a medicinal score of two out of five. Yet its notes on use as medicine lack reports for this species. Its warning about related plants has the same limit. That warning does not prove that Lactuca formosana is toxic. The evidence does not support a firm claim that it is safe. Nor does it support advice to use this species as medicine.