Yes Mark, Allium atroviolaceum can also reach that size and I have found even plants with a full 10cm (4'') flower heads, very nice. The stalk is slim, no more then 1 cm. The commutatum is a more robust plant in overall appearence. Note that both are pratically leafless when in flower, especially the commutatum. Also, both grow in rather stony soils, so good drainage should be provided. Angelo