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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 ...

Look for bigger bulbs as they'll produce bigger blooms. Summer bulbs, such as alliums, agapanthus and cannas, should be planted in spring, when the soil is beginning to warm up. The ideal soil ...