Alliums, a type of ornamental onion ... Autumn is the best time to plant allium bulbs. Depending on your growing zone, the ideal month to plant them is during fall, between September to November.
Experienced gardeners have found this type best suited for informal beds or naturalized spaces. The plants are hardy to USDA ...
spacing them about 20cm apart (or 10cm apart in the case of smaller bulbs, such as ‘Eros’). Some alliums have rhizomes (underground stems) instead of bulbs; these look more like spring onions than dry ...