Allium Globemaster blooms are huge, dense 8"-10" giant spherical orbs of hundreds of purple florets on 28"-36" tall sturdy stems that do not require staking. Globemaster alliums bloom from late spring into early summer, lasting approximately 3 weeks, but the spent flowerheads last for months, providing multi-season landscape interest. Globemaster is a sterile variety and will not self-seed so they are ideal for leaving in place through fall for textural interest. They are deer and rabbit resistant, while being loved by bees and butterflies. Allium grow best in full sun in well-drained soil; wet, soggy locations will cause the bulb to rot. Globemaster Allium is a great cut flower, lasting 10 days to 3 weeks as fresh, or indefinitely dried.
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Bloom Time
 Late Spring | |
 Early Summer | |
Mature Height
31 - 39 inches
Hardiness Zones
Zone 4 Hardy | |
Zone 5 Hardy | |
Zone 6 Hardy | |
Zone 7 Hardy | |
Zone 8 Hardy | |
Suitable Zones
Zone 3 Suitable | |
Zone 4 Suitable | |
Zone 5 Suitable | |
Zone 6 Suitable | |
Zone 7 Suitable | |
Zone 8 Suitable | |
Zone 9 Suitable | |
Sunlight
 Full Sun | |
 Partial Shade | |
When to plant Allium bulbs?
Allium bulb should be planted in fall when daytime temperatures have cooled for the season, but before the ground is frozen for winter.
How to plant Allium bulbs?
Planting depth varies based on each different type of allium. Globemaster Allium should be planted 4-5” deep with spacing of 8-10”. Allium often have a pointed end, that is the side of the bulb that should be planted facing up. If you are not able to tell which side of the Allium bulb is facing up, look for small thin dried roots on one end, that is the bottom of the bulb and should be touching the ground when planted.
Where to plant Allium bulbs?
Allium bulbs grow in hardiness zones 4-9 making them some of the most versatile bulbs for fall planting. Plant Allium bulbs in soil that drains well, they do not like sitting in wet soil over winter. Tall varieties of Allium should be planted in the back of the perennial border or mixed in as accents with shorter bulbs and perennials.
What are good companion plants for Allium?
Peonies, Bearded Iris, and Oriental Poppies bloom at the same time as Allium. These perennials and bulbs make excellent companions for allium to increase color and texture in the garden.
What to do with Alliums after flowering?
Allium flowers will remain in your garden as dried flowers for a few weeks after blooming. Once the stems begin to fade you may remove them from the garden and discard them. To really extend the life of the faded Allium flowers try spray painting Allium flowers and add them to indoor dried flower arrangements.
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