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Forsythia is a genus of about 7 species of mainly deciduous, sometimes semi-evergreen shrubs found in open woodland in E. Asia, with a single species from S. E. Europe. They bear opposite, simple, toothed or entire, sometimes 3-palmate leaves. The 4-petalled yellow flowers are salverform with narrow tubes and produce long or short styles on different plants. They are borne before the leaves in early and mid-spring, often profusely.
Grow in a shrub border, on a bank, against a wall, or as a specimen plant: they are also useful for hedging.
Cultivation : Grow in moderately fertile, most but well-drained soil in full sun or light dappled shade.
F. x intermedia (F. suspensa x F. viridissima). Bushy, deciduous shrub bearing ovate to lance-shaped, sharp-toothed, occasionally 3-lobed leaves to 10cm (4in) long. Deep, bright yellow flowers, 2.5 - 3.5cm (1¼ - 1½ in) across, are produced in groups of 2 or 3 in early and mid-spring.
Source: "The Royal Horticultural Society A-Z Encyclopedia of Garden Plants A-J", page 452
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