Light Needs
Mature Height
Mature Spread
Growing Zones
Ornamental onions like Millenium Allium are power performers in the garden. This variety has the pretty purple globe-like flower of alliums above clumps of slender green leaves. The result is a rush of fragrant, round flower clusters just above a pretty green clump. Both the leaves and flowers of Millenium Allium have a sweet fragrance. And this little onion hybrid has long-lasting blooms in a drought-tolerant plant.
Millenium Allium blooms appear in summer, a little later than some Allium varieties. They grow in nearly any type of soil and attract bees and butterflies to the rounded flower clusters. Deer and rabbits tend to avoid allium plants. At a height of nearly 20 inches and 15 inches wide, this little allium is a great thriller in garden containers or a nice garden bed border. The flowers are perfect for a round, interesting bloom in flower arrangements.
Millenium Allium Care
Plant Millenium Allium in a garden spot or container that gets at least some sun – 4 hours a day or more. You can place it in a container with potting mix or in poor or clay soil. This allium hybrid will adapt to any soil conditions and typically is free of plant disease. It grows as a perennial in zones 4 through 8. Just cut some of the flowers for fresh or dried arrangements; the allium does not need dividing.
Millenium Allium Spacing
For a mass planting of purple globe-shaped flowers, plant several Millenium Allium plants together. Or make a border of the fragrant summer bloomers. Space the plants about 10 to 14 inches apart from center to center.
Millenium Allium Plant Facts
Growing Conditions
- Hardiness ZonesGrowing Zones
- USDA Zones 4 to 8 (perennial); grown as an annual elsewhere (outdoors year-round); grown indoors elsewhere (outdoors year-round); grown in containers elsewhere (grown as a seasonal crop)
- Sun Exposure
- Part Sun to Full Sun (5+ Hours Direct Sun)
- Mature Height
- 1-1.5 Feet
- Mature Spread
- 10-15 Inches
- Growth Habit
- , Upright
- Water Needs
- Dry
Flowers & Foliage
- Flower Colors
- , Purple
- Flower Description
- Purple
- Bloom Time
- Summer to Fall
- Foliage Color
- , Green
- Foliage Description
- Green
- Foliage Type
- , Herbaceous
- Seasonal Interest
- , Summer Flowering
Garden Benefits
Plant Overview
- Common Name
- Millenium Allium
- Also Known As
- Ornamental Onion
- Botanical Name
- Millenium' Allium hybrid
- Brand
- Proven Selections
Simple Plant Spacing Calculator
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.
Also Known As:
Quart
Plant Age:
~ 6 months - 1 year
Plant Size:
~ 4"-8"
Pot Size:
~ 4.75"H x 4.5"W
Volume:
1.50 quarts
Also Known As:
2.5 Quart Pot
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 8"-12"
Pot Size:
~ 6.5"H x 6.5"W
Volume:
2.20-2.30 quarts
Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 1 - 2 years old
Plant Size:
~ 10"-14"
Pot Size:
~ 7"H x 7.75"W
Volume:
2.26-3.73 quarts
Also Known As:
#2 Container
2 Gallon
Plant Age:
~ 1.5 - 3 years old
Plant Size:
~ 12"-18"
Pot Size:
~ 9.5"H x 9.5"W
Volume:
1.19-1.76 gallons
Also Known As:
#3 Container
3 Gallon
Plant Age:
~ 2 - 4 years old
Plant Size:
~ 12"-30"
Pot Size:
~9.5"H x 11"W
Volume:
2.32-2.76 gallons
Also Known As:
#5 Container
5 Gallon
Plant Age:
~3-4 years old
Plant Size:
~ 20" - 60"
Pot Size:
~11" H x 10 1/2” W
Volume:
3.5 - 4 gallons
We stand behind our plants with industry-leading guarantees to give you peace of mind.
We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
Starting January 1, 2026 all bushes, perennials & trees purchased come with an extended 1-year warranty for added confidence. If your plant dies due to a health issue within a year, we’ll make it right.
Plants that are currently in stock typically ship within 2-7 business days after your order is placed.
Plant Addicts ships to the lower 48 states within the U.S. Unfortunately, we do not currently ship to Alaska, Hawaii, or internationally.
This plant cannot be shipped to the following states: ID, NV, OR, WA, AK, HI. These restrictions apply only to this specific plant due to agricultural regulations or other limitations. Other plants may still be available for shipping to these states.
If you have any questions about shipping restrictions, feel free to reach out to our team!