Calceolaria integrifolia aka Bush Slipperwort

Calceolaria integrifolia, known as slipperwort, is a small evergreen sub-shrub from Chile. It belongs to the Calceolariaceae family. The RHS lists Calceolaria rugosa and Calceolaria stewartii hort. as synonyms. It is not native to Britain or Ireland. Its upright growth forms a bushy plant for beds and pots. Though used for summer bedding, it is an evergreen sub-shrub rather than an annual.

Garden plants reach about 1.6–3.3 feet [0.5–1 metre] tall. Their spread ranges from 0.3–1.6 feet [0.1–0.5 metres]. The RHS gives five to ten years to reach mature size. Its leaves have an oval or oblong shape. Each leaf measures about 0.16–0.26 feet [0.05–0.08 metres] long. The upper surface is dull green, with clear veins. Hairs cover the lower surface of each leaf. These leaves remain on the plant through the year.

Bright yellow flowers grow in broad clusters called corymbs. Each flower measures about 0.04 feet [0.012 metres] across. The whole cluster can span about 0.39 feet [0.12 metres]. The RHS recommends removing spent flowers regularly. Cool, moist conditions give the best flowering. This makes the growing site important when choosing a place for it. The source does not give a clear flowering period.

Choose a sheltered site in full sun or partial shade. South-facing and east-facing sites suit the plant. It needs acid soil or acid compost when grown in pots. The RHS lists clay, loam and sand as suitable soils. Keep the soil moist; the profile accepts both drained and poorly drained sites. Its UK hardiness rating is H2, covering minimum temperatures of 1–5°C. It tolerates low temperatures but does not survive freezing. Its use as summer bedding does not mean it can overwinter outdoors in frost.

Use it in flower beds, borders, or patio containers. The RHS also lists courtyard, city and cottage gardens as suitable settings. Its modest size allows it to fit these smaller planting spaces. Raise new plants from seed or take softwood cuttings in late summer. Watch for slugs and snails, which may damage plants. The RHS reports few disease problems. The supplied evidence does not establish edible uses or safety for people or pets.