Giant Allium

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Giant pompoms for garden interest, the Giant Allium (Allium 'Giant') boasts huge spheres packed with hundreds of tiny deep lavender star-shaped blooms in a perfectly round ball of vivid color! So whimsical, like something out of Willy Wonka or Alice in Wonderland, Flowering Onions are sure to spark the imagination! In fact, once yours bloom, don't be surprised to see passersby stop, stare, and go in for a closer look!

Your local pollinators will be coming in for visits, and even the early-arriving hummingbird as well! Plant extra for some of the most extraordinary floral bouquets you can imagine with the addition of these sturdy stems and brilliant balls of color! Not only are these seedheads showy as well, but they last and last through until early summer! Try spray painting the dried seedheads for unique garden sculpture or use them in dried décor!

The strappy green clumps of upright foliage appear with the spring-flowering bulbs and provide great backdrop contrast to their blooms. The sturdy flowering stems soon appear and look like fireworks rising above your other garden plants! Cold hardy throughout USDA growing zones 4 to 8, these funky blooms rise nearly 4 feet in the air on sturdy stems!

Planting and Application:

Giant Allium adds height as a back-of-the-border specimen or as an accent for architectural interest - especially when planted in groupings, which Allium tend to create on their own by naturalizing gradually! Allium are an absolute must for Rock gardens, Cut Flower Gardens, quirky Cottage gardens, or gardens where kids like play! Even once dried on the plant, the seed heads have remarkable form and texture among summer flowers and bulbs!

Make a statement by lining the path to your door with Giant Alliums, your guests will feel like they entered a fantasy land! Formal in structure and stature, plant evenly distributed clumps in front of a backdrop of evergreens or in rows along your paths and walkways.

Create incredible container gardens with these vertical thrillers, even a window box or planter will become fanciful with these additions! Any sunny patio planter, balcony, or terrace garden becomes something magical! The showy Allium blossoms will bob and sway in the breeze!

  • Huge Round Spheres of Deep Lavender Florets!
  • May Blooms Are Great Cut Flowers!
  • Unique Shape, Form & Texture
  • Verticle Eye-Catching Color - Makes a Statement
  • Long-Lasting Flowers - Vital Nectar For Pollinators
  • Green Strappy Foliage Clumps

#ProPlantTips for Care:

Allium are wonderful members of the Onion family but don't worry, they don't smell like Onions unless you crush their foliage. And please don't try to eat them! However, like Onions, they do return year after year. For best performance, provide the full sun for the strongest stems, best color, and vigorous growth. Also, provide Allium with quick-draining soil that doesn't create puddles after rain. Standing water will rot these bulbs fast. Sandy soils or gravel, rocky soil are no problem as Allium are not particular about soil type, it just must be well-drained soil.

Let the foliage stay intact as long as it remains green, this way it continues making food for next year's flower! Once the green foliage turns yellow and brown it can be removed and cleaned up for the summer.

  • Full Sun For Strongest Stems
  • Moderate to Low Moisture Needs Once Established
  • Any Type of Well-Drained Soil
  • One of the Largest Flowering (Non-Edible) Onions
  • Easy Care & Low Maintenance
  • Deer Resistant Perennial Bulbs

Giant Allium will become your spring garden exclamation mark to herald in the growing season with a bang! Hurry and order enough to create the spectacle in your garden and get heads turning your way today! Nature Hills will ship your bulbs based on the correct planting time for your growing zone!

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.

Click Here to learn more

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
4 Now
5 Now
6 Now
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8 Now
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10 Now
11 Now

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


Giant Allium Is Suited to Grow in Zones 4-8
Growing Zones 4-8
More Information
Botanical Name Allium 'Giant'
Mature Height 48 inches
Sun Exposure Full Sun
Soil Well Drained Soil
Moisture Medium
Growth Rate Fast
Flower Color Lavender
Foliage Color Green
Pollinator Friendly Yes
Pruning Time After Foliage Yellows
Spacing 12 inches