Planting Depth When planting allium bulbs, you want to plant them at a depth of two to three times their diameter—typically around 4 to 8 inches deep. Dig a hole that's at least twice as deep as ...

Many gardeners typically grow this plant from bulb and the expense varies, depending on the variety of allium. A bulb of Allium aflatunense, for example, can be sold for 60 cents, meanwhile a bulb ...