Propagation
Sow fresh seeds in situ during spring or in containers.

Take cuttings during summer apply bottom heat. Cuttings should be dipped into charcoal powder to reduce bleeding and the milky sap may be poisonous.

Culture
This plant should be pruned back after flowering in the second year to encourage new growth. 
Contact with the milky sap may cause skin irritation, wear gloves when handling.	

Botanic information
Leaf: The grey-green leaves are linear to obovate and have a small petiole or are sessile.

Flower: The tiny flowers have no perianth segments and are arranged in spherical terminal cyme that appears from spring to early summer. The cymes are cupped by an involucre of greenish fused bracts and have black to purple nectar glands.

Fruit: The 3-valve capsule is an explosive schizocarp and contains the numerous seeds. The small seeds are viable but the plant is commonly reproduced vegetatively to maintain true to type.