Propagation
Sow fresh seed during autumn in situ or in a deep container and commonly no scarification is required. Maintain a temperature of 19º to 27º C. (66º to 81º F) during spring and keep moist. 

The seeds lose viability quickly so do not allow the seeds to dry out. Plant out as soon as possible as the tree dislikes root disturbance.

Note:
Care should be taken when handling the plant as it may cause skin irritation or allergic reaction and the seeds are poisonous if ingested.

Botanic information
Leaf: The pale green leaves are obovate-oblong to spathulate up to 130 mm (5⅛ in) wide with an obtuse apex and a winged petiole-like base that is commonly reddish. The margin has a short deltoid serrations and the whitish mid-rib is thick and prominent.

Flower: The salverform flowers have a narrow cup-shaped calyx up to 8 mm (⅓ in) long and the rose-purple corolla has a narrow tube up to 17 mm (⅝ in) long with a spreading lobes. They are arranged in whorls at intervals on the scape which is up to 400mm (16 in) to 800 mm (44 in) tall and appears from late spring to early summer.

Fruit: The small globose capsule has 5-10 valves and releases numerous tiny seeds that are viable but the plant is commonly reproduced vegetatively to maintain true to type.