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Allium millenium

Status: In stock

Product ID#: amill
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Local Pick-up Waterloo, WI
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Starting at: $25.99
Product Description
Sun Exposure Sun
Bloom Time Summer
Soil Conditions Normal, Sandy, Clay/Heavy, Dry
Flower Color Purple
Mature Plant Size (H x W) 14-22" x 14-22"
Allium Millenium is a modern-looking plant that achieved the 2018 Perennial Plant of the Year and is very easy to grow! Ornamental Onion (Allium) is a clump-forming plant sports long-lasting globe-shaped fruit. The purple globes and foliage will emit a slight 'oniony' fragrance when bruised. This native plant is attractive when planted in a mass. *Does not ship to Idaho*

Get Your Gardening Essentials from McKay Nursery

Allium Millenium isn’t just a viable addition to your vegetable garden; its aesthetic properties make it a stellar attraction that adds color and texture to your landscape. If you want to view more options to revitalize your landscape design, visit one of our garden centers in Wisconsin, or order online! Our nursery contains a wide selection of hardy and vibrant plants, backed by our more-than 125 years of growing experience. Order worry-free and get your very own Allium Millenium today!

For more information, contact us at [email protected] or call us at 920-478-2121.
  • sunshade Sun
  • Mature Plant Size (H x W) Mature Plant Size (H x W): 14-22" x 14-22"
  • Bloom Season Bloom Season: Summer
Key features
  • Attracts Bees
  • Deer Resistant
  • Drought Tolerant
  • Native
  • Low Maintenance
  • Long Blooming
  • Award Winning
  • Attracts Butterflies
  • Cut Flower
  • Fragrant Flowers
  • Fragrant Leaves
  • Attracts Pollinators
Planting Care

Planting & Care for Ornamental Alliums (Allium Millenium)

  • Alliums are best in full sun but will tolerate light shade. Alliums in borders should be positioned where other plants will help to hide their often untidy foliage.
  • The soil must be well-drained and should contain plenty of well-decayed manure or compost.
  • Add a dressing of lime to acid soils before planting.
  • Flowers in late spring and summer.
Opening Plant Material
  • Containers: Completely saturate all container plants by putting them in a larger water container until bubbling stops. Remove the plant, then dig a hole no deeper than the depth of the container, ensuring it’s wider on the sides by an additional 6” or more.
Planting Containers
  • Plant in spring and fall.
  • Dig a hole no deeper than the depth of the container and 6" or wider on the sides.
    Slide the plant from the pot by tapping on the bottom of the pot.
  • With a shovel or knife, trim the bottom 2" off the root ball for plants in plastic containers.
  • Rotate the plant to the proper position. Never lift or move plants by the tops.
  • Place the root ball in the hole.
  • Adjust the plant height so the root crown is slightly higher than the ground.
    Notice where the base of the trunk flares out from the tree. This is called the root flare. This root flare should show when the tree is planted. Add soil under the ball so the root flare is exposed if necessary.
  • Place fertilizer packets into the bottom of the hole (if purchased). *Use Our Recommended Fertilizer.
  • Backfill the hole with soil, ensuring the top of the root ball is visible and slightly higher than the soil around it.
  • Firm the soil around the plant. Water well to settle soil around the root ball.
  • Check out our Planting & Handling Guide for additional planting instructions and illustrations. 
Pruning - After Planting
  • Containers: Although it’s not essential after planting, light pruning can help shape a Millenium Allium. Doing so removes any broken branches from shipping or thins out a heavily branched plant to assist in the transplanting process and the appearance of your new planting.
Pruning - Throughout the Season
  • Cut Alliums when about half of the flowers are open.
  • Foliage starts to die down before blooming is complete. Cut off the spent flower stems if required.
  • Overcrowded clumps can be divided in fall, replanting immediately.
Watering - After Planting
  • Plants typically take approximately 6 weeks to establish new roots in your soil. During this period, water plants as often as every 2-4 days at the start and at least a minimum of once per week.
  • Beyond the six-week establishment period, water once per week unless rain occurs.
  • Remember to check soil moisture by sticking your finger into the soil around 3”.
Watering - Throughout the Season
  • After the first season, plants should only be watered during extended periods without rain.
  • How do you know if your plants need water? The easiest way to tell is to touch the soil around the roots. If it is moist, there is no need to water. If it’s dry, give it a good soak with the hose end (no nozzle), watering the soil only, not the leaves.
  • Same as after planting, stick your finger into the soil around 3” to check soil moisture.

Frequently Asked Questions

What is the best growing zone for Allium Millenium?

Most alliums will do well in USDA hardiness zones 4 to 10. Allium Millenium, in particular, thrives best in growing zones 5 to 9.

How do I propagate Allium Millenium?

Bulb-forming alliums are quite slow to multiply, but they will eventually start producing small offsets on the original bulbs or possibly on the flower head. The optimal method for propagating Allium Millenium is through division either in late fall or early spring.

First, wait until the plants have finished flowering, lift the bulbs, then gently separate the offsets. Replant the offsets immediately at a depth of two to three times the diameter of the bulbs.

Water the replanted offsets thoroughly after planting.

What are the common diseases encountered by Allium Millenium?

Allium Millenium can be susceptible to some fungal diseases, such as root rot and downy mildew. To remedy these issues, simply avoid overhead watering and remove already-infected allium bulbs.

What are the common pests encountered by Allium Millenium?

Ornamental onions, such as the Allium Millenium, don't attract too many insect pests. Additionally, deer and rodents avoid them.

However, ornamental alliums can be susceptible to snails, slugs, and the allium leaf miner. Thankfully, the plant’s foliage doesn’t live too long, meaning the cosmetic damage on leaves is not a long-term issue.

How do I encourage more blooms for a Millenium ornamental onion?

Allium flowers can be encouraged to bloom more by deadheading spent flower heads at the base. You can also stake taller varieties to support the blooms.

Another way to encourage more blooms is to apply slow-release granular fertilizer. Doing this in late summer will balance out the nutrients received by your ornamental onions.

Planting & Handling Help

Download our Planting and Handling Guide below to plan for a successful arrival and install of your plants. Be sure to water all plants as soon as they arrive and every day until you’re ready to plant. Keep any bare root bundles in a shady, cool spot with the roots covered at all times.

Learn More

Watch our videos on handling bare root plants, how your order is prepared for shipment and more.

Plant Sizing

What is the difference between Containers, Grow Bags, Bare Root, and Balled & Burlap (B&B)?

Shipping Times

Our FedEx and local shipping times depend on two factors, one is by the region and the second is the type of product being shipped. For example, small fruits are only shipped in spring, but majority of our perennials are shipped from spring until fall. Keep in mind the dates below act as a general guide. Due to unpredictable weather, staffing, inventory and industry demands these timelines can change. Therefore, we cannot guarantee any of these times.


Shipping Dates by Region*


Northern Cold Region: April 22nd - November 7th

Northern Region: April 15th - November 7th

Middle Region: April 1st - November 7th

Southern Region: March 15th - November 7th

Local Delivery (small radius from Waterloo, WI): April 22nd - November 7th


Shipping Dates by Season*


Spring Shipping: Region Start Date (above) - May

Fall Shipping: September - November


Due to unpredictable weather, these times may vary. Some varieties are exceptions due to heat and plant health reasons. Enter your shipping zip code at the top of this page and be sure to check the shipping information on each product before you add it to your cart. If the product is too large or restricted in your state, you will not be able to checkout with that item in your cart.