Millenium Allium

As low as $39.59 was $59.99
Availability: In stock

Like summer fireworks for your landscape! The Millenium Allium (Allium senescens 'Millenium') explodes in late summer with long-lasting, beautiful lilac-purple blooms! This hardy perennial bulb is easy to care for, and will fill your garden with color and uniquely shaped flowers!

Also known as a flowering or ornamental Onion, unlike most Alliums that flower in the spring, Millennium bursts into bloom in late summer, extending your enjoyment of these unique round globe-shaped flowers! You'll have no shortage of bees, butterflies, and beneficial pollinators clamoring to get to these pollen and nectar-rich flowers!

They may not have a nice smell, but these non-edible onion relatives don't smell oniony unless you crush the foliage. This does make them deer and rabbit resistant though! Hardy throughout a wide range of USDA planting zones 4 to 8, Millennium Allium can reach up to 20 inches tall when in flower, with clumps of lush greenery spreading 10 to 15 inches wide at maturity.

Landscape Application:

Planting several Millenium throughout your perennial bed or Cottage garden to paint your landscape with pops of purple in the summer sun! Must haves for pollinator gardens and perfect for cut flower borders, the flowers last a long time! And after, you are left with curious round seedheads that look great in dried arrangements or add interest to your beds and borders!

While in bloom, you will be treated to deep lavender flowers atop tall stems. The 1.5-inch round clusters of purple blooms will seem to hover over the foliage, like little fireworks exploding over long waving blades of grass-like leaves. Pop a few into pots and mixed planters, or let these perennial bulbs ramble freely through sunny garden areas and en masse.

Equally suited for the informal garden or the formal landscape, it all comes down to how you use these plants! Did we mention kids love these whimsical blooms? Once the flowers fade, try spray painting the seed heads for pops of color around the garden!

  • Round Balls of Lilac-Purple Florets
  • Handsome Clumps of Fine-Textured Foliage
  • Long-Lasting Blooms - Great For Cut Flower Bouquets
  • Beloved By Bees & Butterflies!
  • Clump Forming Edging, Specimens, Container Thrillers, Summer Color & Interest

#ProPlantTips for Care:

Alliums love full sun but in hot climates can also tolerate a touch of afternoon shade. Plant in enriched, well-drained soil and provide just enough water to get established. Fall-planted bulbs are reliable bunching perennials that need to be divided every 3-5 years to maintain the clump's vigor.

Deadhead the flower heads back when they fade (or spray paint them funky colors for summer interest and dried decor). There is no worry since Millenium rarely reseeds. Do leave the foliage in place to make food for the perennial bulb and more flowers next year. Once the leaves turn yellow you can trim them down cleanly at the ground level in the autumn.

  • Full Sun & Some Light Shade In Hot Climates
  • Well-Drained Soil
  • Moderate to Lower Moisture Needs
  • Prune Foliage Down In Late Autumn
  • Hardy & Deer Resistant

Amazing color while in bloom and strappy foliage that is quite handsome, the Millenium Allium will draw your eye in the spring, summer, and fall! Order summer-flowering perennials from today!

Buying Options for Plants

Nature Hills sells a large variety of plants with several options available. Plants are offered in both potted containers and as dormant bare root without soil. Here is a helpful resource to understand your options as you create a beautiful landscape with help from Nature Hills.

Ever wonder what a larger plant will mean for your landscape? Container Sizes are really all about the age of the plant!

Seasonally, Nature Hills offers hand selected, high quality bare root trees, shrubs and perennials. Bare root plants are sold by height from the top of the root system to the top of the plant. Plants may be taller than the height minimums.

  • Popular sizes of select trees are 1 foot, 2 feet, 3 feet, etc.
  • Popular sizes of select bare root plants is 1 foot, 18 inches, etc.

Nature Hills Container Size by Volume

Keep in mind, specific varieties and different growing conditions can affect the rate at which plants grow. Variations in size may occur.

Young Plants to 18 Months
Size Volume
2"x2"x3" Ranges from .18 to .21 dry quarts / .198 to .23 dry liters in volume
4.5" Container Equal to .65 dry quart / .72 dry liter in volume
Sprinter Pot Equal to .63 dry quart / .69 dry liter in volume
4" Container Ranges from .31 to .87 / .35 to .96 dry liter in volume
6" Container Equal to 1.4 dry quarts / 1.59 dry liters in volume
1 Quart Equal to 1 dry quart / 1.1 dry liter in volume
5.5" Container Equal to 1.89 of a dry quart / 2.08 dry liters in volume
4"x4"x5" Ranges from .8 to 1.1 dry quarts / .88 to 1.2 dry liters in volume
4"x4"x6" Ranges from 1.0 to 1.3 dry quarts / 1.1 to 1.41 dry liters in volume
4"x4"x9" Ranges from 1.1 to 2.1 dry quarts / 1.2 to 2.3 dry liters in volume
4"x4"x10" Ranges from 1.7 to 2.3 dry quart / 1.87 to 2.53 dry liters in volume
Plants 18 Months - 2.5 Years Old
Size Volume
2 Quart Equal to 2 dry quarts / 2.2 dry liters in volume
#1 Container Ranges from 2.26 to 3.73 dry quarts / 2.49 to 4.11 dry liters in volume
5"x5"x12" Equal to 3.5 to 4.3 dry quarts / 3.85 to 4.74 dry liters in volume
Plants 2 - 4 Years Old
Size Volume
#2 Container Ranges from 1.19 to 1.76 dry gallons / 5.24 to 7.75 dry liters in volume
#3 Container Ranges from 2.32 to 2.76 dry gallons / 10.22 to 12.16 dry liters in volume
Plants 3 - 5 Years Old
Size Volume
#5 Container Ranges from 2.92 to 4.62 dry gallons / 12.86 to 20.35 dry liters in volume
#6 Container Ranges from 5.25 to 6.01 dry gallons / 23.12 to 26.42 dry liters in volume
#7 Container Ranges from 5.98 to 6.08 dry gallons / 26.34 to 26.78 dry liters in volume

About Plant Sentry™

Plant Sentry is designed to protect both consumers and the nursery trade from invasive plant pests and diseases. Sites that display the Plant Sentry protection badge are protected from consumers buying and nurseries shipping material carrying invasive pests and diseases.

This proprietary eCommerce software prevents the shipment of a restricted plant to each state. The Plant Sentry system includes a shipment certification program. The Plant Sentry Compliance Officer works closely with and each nursery or fulfillment center to ensure only compliant plants are sold to customers.

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Plant Sentry


To obtain a more accurate shipment time-frame, simply enter your zip code in the “Find Your Growing Zone” box to the right. Our plants are grown all over the country and lead time on items may be different because of this. Once your order is placed, you will also receive the specific shipment time-frame information as part of your order confirmation. Once an item ships, you will receive shipment notification and tracking numbers, so you can follow along while your plant travels to your doorstep. We use FedEx, UPS, or USPS at our discretion.

Due to winter weather we have put a hold on shipping to the areas shown below in grey. You can still order now and we will ship the plant to you during an appropriate time for your zone.

*If you have found your zone already, it will be highlighted in the table below.
Color Zone Times
3 Spring 2019
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Shipping Rates

At Nature Hills we handle, package and ship the products you order with the utmost care to ensure healthy delivery. Shipping and handling charges are calculated based on the tables below. Please note that some items include an additional handling surcharge, these will be noted on the item's product page.

From To S&H
0 - 19.99 24.99
20 - 49.99 29.99
50 - 69.99 34.99
70 - 99.99 39.99
100 - 129.99 44.99
130 - 149.99 48.99
150 - 150+ Approx 28%

Click here to see our full rates


Millenium Allium Is Suited to Grow in Zones 4-8
Growing Zones 4-8
More Information
Brand Nature Hills' Choice
Botanical Name Allium senescens 'Millenium'
Type Perennial
Mature Height 15 - 20 Inches
Mature Spread 10 - 15 inches
Sun Exposure Full Sun, Partial Shade
Soil Well-Drained
Moisture Moderate
Growth Rate Fast
Flower Color Lilac-Purple
Foliage Glossy Green
Pollinator Friendly Yes
Pruning Time Late Autumn