When To Plant Alliums. They should be planted in fall between September and November before the soil freezes. Wait until nighttime temperatures cool off to about 4050F before planting your bulbs.
Your allium bulbs need to be planted in the sun. When to Plant Allium. Plant larger ones in the middle while the smallest of the Alliums should be around the edges Growing Alliums If planted correctly from the get-go with proper soil and light growing and caring for Alliums is actually quite simple.
Like most flower bulbs they prefer full sun but will also thrive in partially shaded locations.
Flowers in spring and early summer. You will rarely have to worry about watering them as they actually prefer dry conditions. When to Plant Allium Bulbs. Wait until the soil is 60 degrees Fahrenheit or colder.