Allium 'Globemaster' (Globemaster Ornamental Onion)


Botanical Information

FamilyAmaryllidaceae
GenusAllium
Cultivar'Globemaster'
SynonymsAmaryllidaceae
CategoryBulbs, Perennials
OriginA Dutch cross found in 1966 between A. macleanii from Afghanistan and A. cristophii from Iran.

Details

USDA Hardiness Zone5a - 8b
USDA Hardiness Ref.
Canadian Hardiness Zone4a - 8a
Canada Hardiness Ref.
RHS Hardiness ZoneH4 - H7
RHS Hardiness Ref.
Temperature (°C)-26 -(-7)
Temperature (°F)-15 - 20
Height0.5 - 1m
Spread0.1 - 0.5m
GrowthFast
Flowering PeriodMay, June

Description and Growing Information

General DescriptionLarge bulbous, garlic scented perennial.
ID CharacteristicGrey green leaves with spherical purple flowers on long stems.
ShapeClumping.
LandscapePlant the bulbs in groups for the greatest impact. Since the leaves start to fade about the time the flowers are in full bloom, place the plants behind others to hide the foliage. Alliums are great flowers for the transition period between spring and summer, when the spring flowers are waning and the summer flowers are not quite in full swing.
PropagationRemove offsets in autumn and plant.
CultivationPlant in fertile, humus rich, well-drained soil in full sun to partial shade.
PestsBulb rot can occur during our damp conditions of autumn through spring. Onion fly and thrips may be a problem.
HabitatHorticultural origin.
Leaf DescriptionLong, strap-shaped, green leaves.
Flower DescriptionClusters of deep violet flowers forming a globe shape, 15-20 cm across. Each bloom is composed of approximately 1000 lavender coloured florets. It does not tend to produce seed.

Photographs