Allium (Ornamental Onion)

Product Code: amill

Allium 'Millenium' (Ornamental Onion)
Enter Shipping Zip Code:
Enter Shipping Zip Code:

Details

This modern looking perennial was voted the 2018 Perennial Plant of the Year! This gardener favorite is very easy to grow! The Ornamental Onion (Alliums) is a clump forming plant. This fine selection was named in the year 2000 and sports long lasting globe shaped fruit. These rosy, purple globes as well as the foliage will emit a slight 'oniony' fragrance when bruised. This native plant is very attractive when planted in a mass and will grow in full sun and light shade. Mature size is around 15-18" tall and 20-25" wide. Hardiness zone 5.

Planting & Care for Alliums

Preparation

  • 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.
  • Smaller species are suitable for rock gardens.
  • 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 in a larger container of water until it stops bubbling, then remove. You’re now ready to plant.
  • Scroll down and click on the orange rectangular box "Handling & Planting Guidelines" to see illustrations on how to plant properly. 

Planting containers

  • Plant in spring and fall
  • Slide plant from pot by tapping on the bottom of the pot.
  • With shovel or knife trim bottom 2" off of the root ball for plants in plastic containers.
  • Dig a hole no deeper than the depth of the container and 6" or more, making sure it’s wider on the sides.
  • Rotate the plant to the proper position. Never lift or move plants by the tops.
  • Place the root ball in the hole.
  • Notice where the base of the trunk flairs out from the tree. This is called the root flair. This root flair should show when the tree is planted. If necessary, add soil under the ball so the root flair is exposed.
  • Place fertilizer packets into the bottom of the hole (if purchased). *Use Our Recommended Fertilizer.
  • Backfill the hole with soil, making sure 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.

Pruning - After Planting

  • Containers - Although it is not essential for containers to be pruned after planting, a light pruning for shape, to remove any broken branches from shipping, or to thin out a heavily branched plant will help in the transplanting process and in the appearance of your new planting.

Pruning - Through-out 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 6 week establishment period, water once per week, unless rains occur.
  • Stick your finger into the soil around 3” to check soil moisture.

Watering - Through-out 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 is dry, give it a good soaking with the hose end (no nozzle) watering the soil only, not the leaves.
  • Stick your finger into the soil around 3” to check soil moisture.

 

Go to our "Plant Features & Video Tab" for more information & tips on caring and maintaining this plant.

Handling & Planting Guidelines

Special Features & Videos on Alliums

Special Plant Features & Tips

  • The Ornamental Onion (Alliums) is a clump forming plant.
  • This fine selection was named in the year 2000 and sports long lasting globe shaped fruit.
  • These rosy, purple globes as well as the foliage will emit a slight 'oniony' fragrance when bruised.
  • This native plant is very attractive when planted in a mass and will grow in full sun and light shade.
  • Mature size is around 15-18" tall and 20-25" wide.
  • Hardiness zone 5.
  • 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.
  • Smaller species are suitable for rock gardens.
  • 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.
  • 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.

How to plant containers

ItemApprox Weight (lbs.)Approx Base Dimensions (diameter)Approx Height
#7 Grow Bag** 35-50 14-16" 5-8'
#10 Grow Bag** 55-70 18" 6-8'
#15 Grow Bag** 65-80 22" 6-10'
#20 Grow Bag** 75-100 24" 8-12'
1 1/4" B&B** 250-500 22" for single stems, 28" for multiple stems  8-11'
1 1/2" B&B** 325-600 24" for single stems, 30" for multiple stems  10-12'
2" B&B** 500-700 28" for single stems, 32" for multiple stems 10-14'
2 1/2" B&B** 600-1000 30" for single stems, 36" for multiple stems 10-15'
3" B&B** 850-1000 34"-36"  12-16'
3 1/2" B&B** 1000 36"  12-18'
10' B&B** 250 22"  10'
12' B&B** 325 24"  12'
14' B&B** 500 28" 14'
16' B&B** 600 30"  16'
2' B&B** 50 12-16"  2'
3' B&B** 60-250 16-22"  3'
4' B&B** 250 22-24" 4'
5' B&B** 325 22-24"  5'
6' B&B** 150-325 16-24" 6'
7' B&B** 500-700 28-32"  7'
8' B&B** 600-700 14-30"  8'
9' B&B** 700 32"  9'
#3 container* Less than 35  10" 10" 
#5 container** 40 11" 10.5" 
#7 container** 60 14" 12" 
#10 container** 80 14" 14 
#20 container** 160 19.5" 17" 
Bare Root* varies, but always lighter no soil on roots varies depending on item

*#1 - #3 containers and bare root are the only items that can be shipped FedEx and/or by our delivery trucks (see below for more information regarding pick-up and local delivery. 

**Any items over 100 Ibs., #5 - #20 containers or B&B can only be delivered by our trucks due to FedEx shipping weight and size restrictions. Our trusted trucks only deliver around a 100 miles radius from our corporate office in Waterloo, Wisconsin. Any item you order can be picked-up at our corporate office in Waterloo, Wisconsin or our new retail garden center Winterland Nursery for free (bare root orders cannot be picked up at Winterland due to lack of bare root coolers). See our estimated delivery schedule here

Growing Zones: 5-9

Bloom Time: June - August
Color: Green, Purple
Plant Size: 15-18" tall x 20-25" wide
Flower Color: Purple
Sunlight: Full Sun
Soil Conditions: Normal, Sandy, Clay, Acidic, Dry
Low Maintenance: Yes
Deer Resistant: Yes
Attracts Butterflies: Yes
Attracts Bees: Yes
Attracts Birds: No
Edible: No
Native: Yes

Product Reviews

Write Your Own Review

Only registered users can write reviews. Please log in or register.