Allium ‘Millennium’ – Compact Summer-Flowering Allium with Rosy Purple Blooms
Allium ‘Millennium’ is a reliable and long-flowering ornamental onion, valued for its tidy growth and vibrant summer colour. Unlike taller spring bulb alliums, this clump-forming perennial blooms later in the season, producing rounded clusters of rosy-purple flowers from mid to late summer.
Held on sturdy stems above neat mounds of glossy green foliage, the spherical blooms add structure without dominating surrounding planting. Its compact size makes it especially useful at the front or middle of borders, where it provides consistent colour and form.
Highly attractive to bees and butterflies, ‘Millennium’ is an excellent choice for wildlife-friendly gardens. The flowers remain attractive for weeks and can also be cut for arrangements, while the foliage stays fresh and tidy throughout the growing season.
Thriving in full sun and well-drained soil, this hardy perennial is easy to grow and tolerant of heat and dry conditions once established. It returns reliably year after year, forming gradually expanding clumps.
Compact, colourful, and wonderfully dependable, Allium ‘Millennium’ is ideal for adding late-season structure and pollinator appeal to UK gardens.
Seasonal Highlights
Spring: Neat green foliage forms compact clumps.
Mid–Late Summer: Rosy-purple spherical flowers bloom.
Early Autumn: Seed heads add subtle structure.
Winter: Herbaceous plant dies back, re-emerging in spring.
Key Features
Summer flowering – Blooms later than bulb alliums.
Rosy-purple spheres – Vibrant seasonal colour.
Compact habit – Ideal for smaller spaces.
Pollinator-friendly – Loved by bees and butterflies.
Hardy perennial – Returns reliably each year.
Perfect For
Front or middle of borders – Controlled height.
Wildlife gardens – Excellent nectar source.
Containers – Patio and terrace planting.
Prairie-style schemes – Blends with grasses.
Long-season colour – Extends interest into late summer.
Growing Tips
Sun/Position: Full sun.
Soil: Well-drained soil; tolerates drier conditions once established.
Hardiness: Fully hardy across the UK.
Care: Cut back stems after flowering; divide clumps every few years if needed.
Does the height include the pot?
No, we measure from the top of the pot to the tip of the plant except for some of the instant planted screens, in this case it will be stated in the description
How long does delivery take?
Most orders are delivered in just a few days, Smaller items are often sent with Parcelforce on a next day service, Larger items should allow up to 10 days due to the size of the items they often have to be sent on our own transport.
Where will you leave my plants?
We will leave your order at the front of your property, Parcelforce may
leave your items in a safe place if you let us know, Pallet couriers
will require a flat hard surface to deliver to, no gravel or soil, a
driveway or parking spot would be best. Most importantly Deliveries by
pallet courier will require access for a large truck (bin lorry sized)
to get near the delivery point. Deliveries sent on our own transport may come in a small van or larger truck.
