Allium sphaerocephalon, named by Linnaeus 1753 is also known as The Roundheaded Leek. A very inexpensive bulb which packs quite a punch! A summer flowering Allium with rather egg shaped heads, initially completely deep green, but beginning with a purple tip the whole head turns deep reddish purple, about 24" (60cm)tall. The intermediate state with purple and green is I think the most interesting. Insects love them and a small thicket is a great sight adding colour, movement and interest. The shape goes well with some of the similarly spiky Sea Hollies.
Allium sphaerocephalon should be planted 3" (7.5 cm) deep in a sunny spot in well drained soil and about 3-4" (7.5-10 cm) apart. Such small bulbs are amazing in their abiliy of doing so well. Interplant them amongst your summer flowering plants to weave things together.