Allamanda are popular as ornamental plants cultivated for their large, colourful flowers. Most species produce yellow flowers although A. blanchetii bears pink blooms. The flower has five lobed sepals and a bell- or funnel-shaped corolla of five petals. The plants do not tolerate shade or salty or alkaline soils, and they are sensitive to frost. They grow rapidly, sometimes spreading 3 meters per year. They can be propagated from cuttings. Dwarf allamanda varieties are excellent small hedges, or to line sidewalks or walkways.