Millenium Allium
Allium senescens 'Millenium'
Planting & Care
Planting & Care
Delivery and Shipping
Delivery and Shipping
Preorder Shipping Schedule
We ship your plants when it's safe to transport them to your zone. Dates are estimated and subject to weather delays.
| Zone 3-4 | Week of March 30th |
| Zone 5 | Week of March 16th |
| Zone 6-12 | Week of March 2nd |
Shipping Rates
Ships in 7-10 business days • Tracking provided • Weather protected
| Under $50 | $9.99 |
| $50 - $99.99 | $14.99 |
| $100 - $149.99 | $16.99 |
| $150 - $198.99 | $24.99 |
| $199+ | FREE |
✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee
Understanding Our Container Sizes
At Nature Hills, our plants are sold in industry-standard nursery containers. You will notice we use the word "container" rather than "gallon." Container numbers follow a nursery trade size standard, not liquid volume. The number tells you the plant's size category and general maturity level. A larger container means a more established plant with a stronger root system.

Container Sizes
Quart
Plant age: 6 months to 1 year
Best for: Ground covers, perennials, ornamental grasses
What to expect: Our smallest and most affordable size. Well-suited for planting in multiples across a large area. Allow 1 to 2 seasons for full establishment.
#1 Container
Plant age: 1 to 2 years
Best for: Shrubs, perennials, smaller trees
What to expect: About the size of a large coffee can. A well-developed root system in a manageable size. Good value choice when you have time to let the plant grow into the space over a season or two.
#2 Container
Plant age: 2 to 3 years
Best for: Shrubs and trees where you want faster establishment
What to expect: A noticeable step up from a #1 in both plant size and root development. Good choice when you want visible presence without going to a larger size.
#3 Container
Plant age: 3 to 4 years
Best for: Most plants, most situations — flowering trees, shade trees, evergreen shrubs
What to expect: Our most popular size. Strong, developed root system. Plants in a #3 container make an immediate visual impact from day one. If you want a head start rather than waiting seasons for a plant to fill in, this is typically the right choice.
#5 Container and Larger
Plant age: 4 to 5+ years
Best for: Specimen plants, privacy screens, maximum instant impact
What to expect: Large, mature plants ready to make an immediate statement in your landscape. We also carry #7 and larger sizes for select varieties.
Why "Container" and Not "Gallon"?
Nursery container sizes follow an industry trade standard established for the nursery and horticulture industry. The number is a size designation, not a measurement of liquid volume. Actual soil volume varies by plant type, root mass, and growing medium. Using "container" is the accurate industry term. When you see #1, #2, or #3, think of it as the plant's size tier, not a gallon measurement.
Root Pouch Containers
Some Nature Hills plants arrive in a Root Pouch, a breathable fabric container made from 100% recycled materials. Root Pouches encourage denser root development through air pruning, which discourages root circling and promotes a stronger, more fibrous root ball at the time of planting.

There are two types. Knowing which one you have changes how you plant:
- Degradable (brown or tan fabric): Plant the entire pouch directly in the ground. The fabric breaks down naturally in the soil over time.
- Non-degradable (black or gray fabric): Remove the pouch before planting. Cut the bottom open with scissors, then peel the sides away. The fibrous root ball will hold its shape.
Not sure which type you have? Check the tag on your plant or contact us and we will confirm.
Full Root Pouch planting guide
Choosing the Right Size
| Size | Plant Age | Best For |
|---|---|---|
| Quart | 6 mo to 1 yr | Ground covers, perennials, grasses. Budget-friendly for mass plantings. |
| #1 Container | 1 to 2 yrs | Shrubs, perennials, small trees. Value choice for patient gardeners. |
| #2 Container | 2 to 3 yrs | Shrubs and trees where you want faster establishment. |
| #3 Container | 3 to 4 yrs | Most plants. Immediate visual impact. Our most popular size. |
| #5 and larger | 4+ yrs | Specimen plants, privacy screens, maximum instant impact. |
Still not sure which size is right for your project? Our plant specialists are happy to help. Contact us and we will point you in the right direction.
Plant Sentry™ Protected
Your order is protected by our compliance system that:
- Prevents restricted plants from shipping to your state
- Ensures plants meet your state's agricultural requirements
- Protects gardens from invasive pests and diseases
Description
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 NatureHills.com today!
Specifications
-
Botanical Name
-
Class
-
Species
-
Cultivar
-
Growing Zones
-
Height
-
Width
-
Sunlight
-
Growth RateFast
-
Flower Color
-
Leaf Color
-
FragrantYes
-
Bloom PeriodEarly Summer, Late Summer
-
Does Not Ship ToAK, HI, ID, MT, OR, PR
Characteristics



