Genus of more than 1000 species of trees, shrubs and climbers. They are mainly evergreen and more rarely deciduous species, grown for their flowers and seldom for their foliage.
Thermophilous and photophilous species. They grow in well-drained, neutral or alkaline soils with small requirements in water.
Propagated mostly by seeds but also by cuttings ot grafting.
Big shrub or small evergreen tree with green foliage. Small yellow flowers are borne intermittently year round. Plant alone or in rows.