Rhoicissus rhomboidea
| Glossy forest grape (Rhoicissus rhomboidea) | |
|---|---|
| Scientific name | Rhoicissus rhomboidea |
| Genus | Rhoicissus |
| Family | Vitaceae |
| Order | Vitales |
| Common names | Glossy forest grape |
| Native range | South Africa, Eswatini, Mozambique and Zimbabwe |
| Habitat | Forest and forest margins |
| Growth | Evergreen climber or small tree, 3–6 m |
| Leaves | Trifoliate, glossy leaflets with forked tendrils |
| Flowers | Small greenish-yellow flowers, September–January |
| Fruit | Grape-like clusters ripening dark red to purple |
| Propagation | Seed or stem cuttings |
Rhoicissus rhomboidea is an evergreen climber or small tree in the grape family, Vitaceae. It is native to forest and forest-margin habitats in South Africa, Eswatini, Mozambique and Zimbabwe, and is adapted to tropical and warm-temperate climates.[1] The accepted name is Rhoicissus rhomboidea; Cissus rhomboidea is a recorded synonym.[2][3][4]
Description[edit | edit source]
The plant grows as a vigorous climber or, when supported differently, a small tree about 3–6 m tall. Young parts and the undersides of leaves may carry rust-coloured hairs. Leaves are trifoliate, with glossy leaflets and forked tendrils that help the stems climb. Small yellowish-green flowers arise in the leaf axils.[1][3]
The fleshy fruits form in clusters and ripen from dark red to purple or purple-black. Their grape-like appearance gives the plant its common name. Human consumption is recorded, but that use record is not a food-safety assessment.[1][3]
Cultivation[edit | edit source]
Soil and water[edit | edit source]
Use a well-drained soil or container medium. Well-drained soil is specified for sowing seed, so avoid a persistently saturated, airless root zone. Forest-margin origin suggests that organic matter can be useful when drainage remains open; that habitat-based interpretation is a cultivation starting point rather than a measured soil requirement.[1][3]
Regular summer feeding is recommended for established plants, with excess water allowed to drain freely.[1]
Sun and humidity[edit | edit source]
Its forest and forest-margin habitat supports a cautious starting position in bright filtered light or gentle morning sun, with protection from drying wind. This is a habitat-based inference, not a tested universal shade or sun limit. A trellis, string or comparable support is appropriate because the plant is a vigorous climber.[1][3]
Pinch growing tips to control the climber and encourage a manageable framework. The species account describes tolerance of neglect and few pest or disease problems, but those observations do not remove the need to monitor plants under local conditions.[1]
Seasonal changes[edit | edit source]
In the southern-African cycle, flowering occurs mainly from September to January. Fruit clusters develop from about January to April, with fruiting sometimes continuing into October; a regional Flora of Zimbabwe treatment gives October–December flowering.[1][3] These calendar windows will shift with latitude, hemisphere and local temperature. Concentrate summer feeding, training and moisture management during active growth rather than treating the dates as a fixed schedule everywhere.[1]
Propagation[edit | edit source]
Both seed and stem or tip cuttings are documented propagation routes. For semi-hardwood cuttings, the species account gives a 4:3:1 mixture of compost, milled bark and sand and recommends a suitable semi-hardwood rooting hormone. It places cutting work in late spring and seed sowing in spring in well-drained soil.[5]
A named Mediterranean garden record gives a more specific seed starting protocol: sow about 4 mm deep in a well-drained medium at 20–25 °C with moisture and daylight, with a stated 3–6 week germination expectation.[6] That same record includes seven seedlings from one wild-origin collection, a separate batch in which seedlings emerged but did not survive, and several batches with no germination. Treat the temperature, timing and outcome as site-specific observations, not as a guaranteed germination rate or schedule.
Flowering, fruiting, and harvest[edit | edit source]
Small greenish-yellow flowers are followed by fleshy fruit in clusters. The main flowering and fruiting windows are September–January and January–April respectively in the southern-African horticultural account, while a regional flora lists October–December flowering. Ripening fruit is dark red to purple or purple-black.[1][3]
Harvest ripe clusters after the fruit has reached its dark red-to-purple color. Local harvest timing will vary with climate and season. The fruit is recorded as eaten by humans, but that use record is not a food-safety assessment.[1]
Fruit and uses[edit | edit source]
The grape-like fruits are borne in clusters and ripen dark red to purple or purple-black. Human consumption is recorded for the species, but that use record does not establish food safety or preparation requirements.[1][3]
Cultivars and selections[edit | edit source]
The RHS entry for Cissus rhombifolia 'Ellen Danica' gives Rhoicissus rhomboidea 'Ellen Danica' as a synonym and describes a compact, bushy foliage plant for lightly shaded positions, about 1–1.5 m tall and 0.5–1 m wide. Treat it as an ornamental foliage selection, not as a documented improvement in edible-fruit production.[7]