Propagation
Take stem cuttings from spring to summer. Allow the cuttings to dry and form a callus before planting into a very well-drained gritty media.
Division of the clump during spring.

Botanic information
Leaf: The mid-green lanceolate to elliptical sessile leaves are blue green on the underside and up to 55 mm (2⅛ in) long with an acute to obtuse apex. The entire margins are reddish and the pale green mid-rib is prominent. The branch leaves are narrower that the stem leaves.

Flower: The male and female flowers are arranged in a cup-shaped involucre-like organ (cyathia) that has large yellow bracts. The male flower has numerous stamens and the female consists of a 3-celled pistil. The flowers are arranged in a terminal cyme that is up to 200 mm (7¾ in) wide and appear from late-spring to midsummer. 

Fruit: The 3-valve brown oval capsule is an explosive schizocarp and contains the numerous seeds that are viable but the plant is commonly reproduced vegetatively to maintain true to type.
Note:
Care should be taken when selecting a site as all Euphorbia's contain white sap that causes skin and eye irritation. Be certain to wash your hands with soap and water after handling plant material.