'Millenium' is a hybrid ornamental in the onion family (Amaryllidaceae) bred by Mark McDonough. The parentage is unknown. It grows 1 to 1.5 feet tall in full sun to partial shade in dry to medium moist, well-drained soil. Plant bulbs in the fall and deadhead spent flowers to prevent unwanted self-seeding, although this particular allium doesn't reseed too readily. Divide bulbs as needed in spring or fall. Flowers appear in mid to late summer on 18 to 20-inch sturdy stems. The long-lasting rosy purple florets appear in round umbels up to 2 inches across. The narrow upright leaves and flowers have an onion-like odor but are not edible. It was selected as the 2018 Perennial Plant of the Year® by the Perennial Plant Association. Use this Allium in borders or groups of cutting or cottage gardens. Insects, Diseases, and Other Plant Problems: - Bulb rot can occur in poorly drained soils. Watch for thirps. Watch for mildew, rust and leaf spots.
Curated pairwise relationships between this plant and others in the library — who feeds
whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.
No curated interactions recorded for this species yet.
Also noted by NC State
Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell
apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.