RHS old seed: Euphorbia characias subsp. wulfenii 1.2 x 1.2m. Upright evergreen shrub with biennial shoots and clumps of erect purple tinged stems bearing grey green leaves. Yellow green cyathia early spring to early summer. Cut out flowered shoots if seed not required. Well drained light soil in full sun. Sow in a cold frame in spring. Divide in early spring or take basal cutting spring / early summer. Dip cuttings in lukewarm water to prevent bleeding. Sown 31/3/16 in unheated greenhouse.