This grower is sure of this plant identification.
These are two year old well rooted plants that are ready to be planted out.
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