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Growing Allium

Growing Allium

Allium, or Ornamental Onion, is a hardy perennial bulb. There are multiple forms grown for their attractive flowers in garden borders, as specimen plants, and for cut and dry flowers. Some are good for rock gardens and naturalizing. Most are hardy in zones 4 to 8. Their large starry "fireworks" flower umbels provide color and interest in dwarf to tall sizes. Plants flower in late spring or early summer. Seed heads make interesting dry cut flowers. Bulbs are usually are planted in fall, but some types can be spring planted. Plant bulbs pointed end up, small bulbs 3 to 5 inches deep and large ones 6 to 8 inches deep.

Fertilizer Recommendations

51244-Bulb Buddy Fertilizer

Alternative Products

Other Early Summer Bloomers: Camassia, Foxtail Lilies (Eremurus); Iris

Complimentary Products

Daffodil, Galanthus (Snowdrops), Leucojum (Snowflake), Tulips & Hardy Ornamental Grasses


Low-maintenance, easy-to-grow plants. Drought-tolerant and require well-drained soil. Tolerates light shade, but stems may need support in shady conditions. Raised beds can improve drainage, as can amending soil with organic matter. After plants flower, do not remove leaves until they naturally die. This allows bulbs to "recharge" with nutrients for overwintering.

Product Recommendations

51106-John & Bob's Soil Optimizer

Benefits of Growing Allium

Helps improve drainage in heavy clay soils

Allium Facts

Usually pest and problem-free. Deer and rodents do not eat them. Ornamental Allium is related to chives, garlic, and edible onions.

Growing Tips