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A picture of a Allium 'Globemaster'

Allium 'Globemaster'

Allium 'Globemaster'

Also known as

Ornamental Onion, Ornamental allium, Onion

Photo by CandideUK (All rights reserved)

Full Sun
Easy care
Light watering
Frost Hardy

H6

RHS hardiness

-20°C

Minimum temperature

Expected size

Height
Spread

80cm

Max

20cm

50cm

Min

10cm

5 years to reach maturity

Flowering

  • spring
  • summer
  • autumn
  • winter

This plant has a mild fragrance

More images of Allium 'Globemaster'

A photo of Allium 'Globemaster'
A photo of Allium 'Globemaster'

Allium 'Globemaster' Overview

Allium 'Globemaster' is a perennial bulb that produces round purple heads in mid summer at the top of 80cm stems . These spherical heads are made up of densely packed individual star-shaped flowers and can get to 15cm across. An easy to grow bulb, it needs to be planted in autumn into soil that doesn't get too wet. Allium 'Globemaster' produces strappy leaves that will start dying back before its flower head has fully opened, making them ideal to plant in amongst grasses or later growing perennials to give a prairie style. The spent flowerheads will stand for a long time and can be left to give some winter interest or cut for floral arrangements. Allium 'Globemaster' is part of the Royal Horticultural Society “Plants for Pollinators” initiative to showcase plants which support pollinator populations by providing ample amounts of nectar and/ or pollen. A great choice for encouraging pollinating insect wildlife into your garden! This cultivar has earnt a Royal Horticultural Society Award of Garden Merit.

Common problems with Allium 'Globemaster'

How to harvest Allium 'Globemaster'

Flowers can be cut for floral arrangements as needed.

How to propagate Allium 'Globemaster'

Seed

Seeds are thinly sown directly at least 5 cm apart, in rows 30 cm apart. Onion sets are produced by sowing seed thickly in poor soil and the small bulbs produced are harvested and planted the following spring and grow into large bulbs

Bulbs

Plant bulbs in autumn up to three times their diameter. Pefer's fertile, well-drained soil in full sun. If you have clay soils, add grit to improve drainage.

Division

Division of clumps (spring flowering varieties in late summer and summer flowering varieties in spring).

Special features of Allium 'Globemaster'

Attractive flowers

Attracts useful insects

Repels harmful insects

Their mild onion scent can repel harmful insects from other plants

Pot plant

Suits being grown in raised beds or larger containers to balance the height of the flowering stem.

Other uses of Allium 'Globemaster'

Allium 'Globemaster is perfect for growing in drifts in a prairie style garden or large clumps in a sunny border. Alternatively in a large container, and makes an impressive cut flower. It suits both formal and informal planting schemes.