This grower is fairly sure of this plant identification.
Silvery white flowered variety. Small plants in 9cm pots
Echinops sphaerocephalus (Globe thistle). A clumped perennial from Central and south Europe. Grey green leaves are pinnatifid to pinnatisect and pinnately lobed. Flowers are blue-mauve and appear in mid summer.
They are fully hardy and will grow well in full sun in poor soil. Dead head to prevent self seeding.
Grown for their globe-like, spiky flower heads. Borders. Suitable for coastal conditions.
Italics = data drawn from parent genus or speciesView Full Plant Finder Record