Alpine leek (Allium victorialis)

This onion forms a sheathed bulb ("root-stalk") about the thickness of a finger and 5–8 cm  long. Leaves with short leafstem are broad and green,  flowers atop strong stems are whitish green. This plant is edible. Grows well underneath and between trees and shrubs, potager, rock garden and garden beds.

Winterhard perennial bulb
Height 30-60 cm
Width 15-30 cm
Spacing 20 cm
Flowering time June-July
Site partially shaded to shaded, medium moisture to moist well drained soil 
Propagation bulblets, seeds, dividing the clump