About Alliums
Millenium Allium is a clump-forming, herbaceous perennial allium celebrated for its compact form, glossy green foliage, and abundant rose-purple flower globes that appear in midsummer. Unlike many ornamental onions, it is sterile and therefore won’t reseed aggressively. Reliably blooming year after year, the flowers attract bees, butterflies, and other pollinators while remaining unappealing to deer and rabbits. Hardy in Zones 4 through 9.
When to Plant Allium Roots
Plant dormant roots in spring as soon as the soil is workable and danger of frost has passed. Doing so allows roots to establish before the summer bloom season.
Where to Plant Allium Roots
Planting in a full sun location will promote strong flowering and dense foliage. Our warmest zones can plant in an area that receives light afternoon shade. Choose a spot with well-draining, sandy or loamy soil and enrich it with compost or organic matter. Avoid areas with heavy clay or waterlogged conditions which can cause rot.
How to Plant Allium Roots
Loosen the soil 8 to 10 inches deep and amend with compost for nutrients and to improve drainage. Plant roots two to three inches deep with the growing point or crown one inch below the soil surface. Space roots 10 to 15 inches apart to allow mature clumps to expand.
Water thoroughly after planting to help settle the soil around the roots and keep the area evenly moist while the roots establish themselves. Ensure the water drains well to avoid soggy conditions.
Allium Millenium can be planted in a large container, at least 10 inches deep filled with gritty, well-draining potting mix. Ensure the container has proper drainage holes.
How to Care for Allium
Allium has moderate water needs, requiring regular watering during dry spells, especially during the first growing season. Once established, allium plants are drought tolerant.
Either remove spent flower heads to encourage tidy growth or allow them to persist through the fall and winter. The globe-shaped heads provide some garden architecture through frost and snow. Cut back foliage only once it yellows and dies back naturally in late fall.
Cold hardy to Zone 4, plants will appreciate an application of light mulch to protect the crowns after the ground freezes in the coldest climates.
Pairs beautifully with Echinacea, Coreopsis, Nepeta, Salvia, Sedum, and ornamental grasses. Its neat shape and late-summer color make it a perfect border or pollinator garden accent.