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‘Millenium’ Allium Growing Guide

By: James A. Baggett James A. Baggett
Loaded with lavender-pink blooms in summer, ‘Millenium’ allium delivers long-lasting color that draws in pollinators and is also deer-resistant!

Millenium allium mass planting: ‘Millenium’ allium is perfect for planting in mass for impact and to attract pollinators.

Add easy-care ‘Millenium’ allium to your garden

It’s not often that a perennial comes along that can be described (just like Mary Poppins) as practically perfect in every way. But that is a practically perfect description for ‘Millenium’ allium. Close to foolproof, ‘Millenium’ is super drought tolerant and grows from a group of small bulbs packed together in a large clump. Plants have a compact, upright habit with grassy leaves and a profusion of large 2-inch, lavender-pink drumstick flower heads that bloom for up to a month or more in mid- to late summer.

Millenium allium botanical illustration by Carlie Hamilton: Botanical illustration by Carlie Hamilton.

‘Millenium’ allium (Allium hybrid)

Type Perennial
Blooms Large 2-in. bright rosy-purple rounded clusters in mid- to late summer
Light Full sun
Soil Well-drained
Pests None
Size 15 to 20 in. tall, 10 to 15 in. wide
Hardiness Cold hardy USDA zones 4 to 9

Growing tips

  • ‘Millenium’ allium tolerates a wide range of well-drained soils, from sandy to fertile loam. But dense clay can cause the cluster of bulbs to rot.
  • Grow plants in full sun to get the most flowers. In hot summer climates, plants appreciate some light afternoon shade.
  • No need to fertilize.
  • Annual maintenance is simple. Just cut back the foliage of ‘Millenium’ allium every fall after the plants fade or in early spring before new growth starts.

'Millenium' allium butterfly: ‘Millenium’ allium forms a clump of lavender-pink pompoms that attracts pollinators like this painted lady butterfly.

Pests don't bother ‘Millenium’ allium

There are no serious pest or disease problems to bother ‘Millenium’, and it's quite deer-, rabbit- and squirrel-resistant. Like other members of the onion family, the leaves, when bruised, release an onion scent that helps keep these pests away. What’s more, the flowers are highly attractive to bees and butterflies, which flock to its distinctive flowers.

Enjoy multiseason interest

‘Millenium’ belongs at the front of the border where you can really enjoy the pollinating insects it attracts all season long. And while some alliums can look scraggly in the heat of the summer, ‘Millenium’ doesn’t let the heat bother it. Its late-flowering habit makes it a smart choice for breathing new life into tired beds and borders as the season winds down. The umbels, or flowerheads, are completely round and as the flowers dry, they turn light brown with a blush of their former pinky-purple tinge.

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'Millenium' allium in a garden border: Clumps of allium can be
divided every couple of years.

Does ‘Millenium’ allium spread?

Unlike many ornamental alliums, self-seeding isn't a problem with ‘Millenium’ allium because the flowers aren't very fertile so spreading isn't a big concern. Division is the best way to get more of this cultivar. In either early spring or fall dig up established plants and pull the dense cluster of small bulbs apart planted 3 to 6 inches deep.

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Published: July 27, 2023

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