This grower is fairly sure of this plant identification.
Grows happily all over the place - keep finding chives in beds where I never knew any had been planted. Great grower and lovely purple flower heads.
Chives, Cive, Schnittlaugh, Onion grass, Seithes, Seives
Allium schoenoprasum (Chives). This is a hardy perennial bulb with narrowly cylindrical leaves and small rounded umbels of purple bell-shaped flowers which fade to pale purple.
Easy to grow in any well drained, loamy soil with full sun. When the plants become leggy, trim the hollow, grass-like leaves to renew the planting. Deadhead the fading flowers to promote further blooming.
Culinary, border, container, edging, rock garden.
This is an edible herb which will taste of onion. The flowers can be used to make a delicately flavoured and pink-tinged vinegar.