Callirhoe leiocarpa aka Annual Wine Cup

Callirhoe leiocarpa is a mallow from the central United States. It belongs to the family Malvaceae. Common names include tall poppy-mallow and long-stalked poppy mallow. The RHS lists Callirhoe pedata as a synonym. Kew records it as an annual or biennial plant. Plants For A Future describes it as an annual. Its native range has a temperate climate. It grows in prairies, plains, woods, and mesquite groves.

This plant reaches about 3 feet (0.9 metres) in height. Plants For A Future notes that its form can vary. It flowers in August, with seeds ripening in September. Each flower has both male and female organs. These dates describe the flowering and seed season reported by that source. The available species accounts give no details of flower colour. They also give no species-level account of its leaves or fruit.

Grow this plant in full sun, rather than shade. It prefers a rich, light soil with good drainage. A sandy loam suits its stated needs. It accepts mildly acid, neutral, and mildly alkaline soils. Soil may be dry or moist, but should drain well. Plants For A Future lists USDA zones 5–9 for cultivation. It also reports cold tolerance near 5°F (−15°C). The plant can grow in cultivated garden beds.

Take care not to disturb the roots when planting. Set young plants in their final place as soon as possible. Direct sowing in April avoids the need to move seedlings. Seed can also start in pots within a cold frame. The source suggests placing a few seeds in each pot. Plant these out in early summer after sufficient growth. Seedlings should reach about 0.5 feet (0.15 metres) before planting out. Germination may take one to six months at 59°F (15°C). Slugs pose a serious risk to fresh spring shoots. They can destroy even established plants by eating this growth. Protect young plants from slug damage during establishment.

The root is the part listed for food use. It has a shape like a parsnip and is eaten cooked. Plants For A Future rates its food value at two out of five. The source records no known medicinal or other uses. It lists no known hazards, but gives no specific pet-safety assessment. It does not flag the species as a weed.