When To Plant Alliums. Plant allium bulbs in early to mid autumn. Will alliums grow in shade.
These may be planted at any time during the growing season. When to Plant Allium Bulbs. You will rarely have to worry about watering them as they actually prefer dry conditions.
They do not like to be.
Herbaceous alliums such as Allium tuberosum and Allium Millenium have fiberous roots like other perennials. When to Plant Alliums. If youre using containers fill them with potting soil with adequate drainage. Wait until nighttime temperatures cool off to about 4050F before planting your bulbs.