This grower is sure of this plant identification.
Euphorbia characias var. wulfenii (Spurge). Clusters of greyish-green leaves are produced one year, and spikes of yellow-green blooms appear the following spring.
Watch out it is poisonous and allergenic.
Border, hedging, edging, foliage, ornamental
Italics = data drawn from parent genus or speciesView Full Plant Finder Record