Allium ‘Globemaster’ – Dramatic Giant Flower Spheres for Late Spring
Allium ‘Globemaster’ is one of the most impressive ornamental onions, producing exceptionally large, densely packed violet-purple flower spheres in late spring. Each rounded bloom can reach up to 20–25cm across, creating a bold architectural statement in borders.
Held high on strong, upright stems, the flower heads rise above surrounding planting, adding height and structure without heaviness. The rich purple tones pair beautifully with early summer perennials and ornamental grasses, while the clean globe shape brings rhythm and repetition to planting schemes.
Highly attractive to bees and other pollinators, ‘Globemaster’ is as beneficial as it is beautiful. The blooms are long-lasting in the garden and also make striking cut or dried flowers. After flowering, the seed heads can be left in place to extend seasonal interest.
Thriving in full sun and well-drained soil, this hardy variety is reliable and low maintenance. Once established, it returns each year, forming impressive clumps with minimal care.
Bold, elegant, and unmistakably architectural, Allium ‘Globemaster’ is a superb choice for adding late spring drama to UK gardens.
Seasonal Highlights
Spring: Broad, strap-like foliage emerges.
Late Spring: Giant violet-purple spheres bloom.
Early Summer: Seed heads provide additional structure.
Winter: Bulbs remain dormant underground.
Key Features
Extra-large flower heads – Up to 25cm across.
Rich purple colour – Strong visual impact.
Architectural form – Adds height and structure.
Pollinator-friendly – Excellent for bees.
Long-lasting blooms – Effective fresh or dried.
Perfect For
Mixed borders – Back or middle planting.
Architectural schemes – Bold focal points.
Wildlife gardens – Nectar-rich flowers.
Contemporary gardens – Clean structural lines.
Cutting gardens – Dramatic arrangements.
Does the height include the pot?
No, we measure from the top of the pot to the tip of the plant except for some of the instant planted screens, in this case it will be stated in the description
How long does delivery take?
Most orders are delivered in just a few days, Smaller items are often sent with Parcelforce on a next day service, Larger items should allow up to 10 days due to the size of the items they often have to be sent on our own transport.
Where will you leave my plants?
We will leave your order at the front of your property, Parcelforce may
leave your items in a safe place if you let us know, Pallet couriers
will require a flat hard surface to deliver to, no gravel or soil, a
driveway or parking spot would be best. Most importantly Deliveries by
pallet courier will require access for a large truck (bin lorry sized)
to get near the delivery point. Deliveries sent on our own transport may come in a small van or larger truck.
