Yellow mandevillas are just recently gaining recognition. The flower color is almost neon yellow throughout. Grows as a vine-like shrub when it is young. Left to it own devices, it develops into a sprawling vine climbing over nearby shrubs, trees and other structures. Flowers are about 2-3 inches across, produced year-round on stem tips, although the plant is not covered with flowers like the Allamanda. There are usually some flowers on the plant all year long. Flowering period: June-October. All parts of plant are poisonous if ingested. Handling plant may cause skin irritation.