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Allium giganteum, also known as Giant Onion, is a perennial bulbous plant of the onion genus, used as a flowering garden plant, and growing to 2 metres. It is the tallest ornamental Allium in common cultivation. In early to midsummer, small globes of intense purple flower heads (umbels) appear, followed by attractive seed heads. A popular cultivar, 'Globemaster', is shorter (80 centimetres (31 in)) but produces much bigger, deep violet, flower heads (15–20 centimetres (5.9–7.9 in)). Both varieties have been granted the Royal Horticultural Society's Award of Garden Merit.
NAME: Giant Allium ‘Globemaster’
SCIENTIFIC NAME: Allium Giganteum
COLOR: Purple 6 - 8” round flower heads
PLANT SEEDS: Outdoors after frost / Indoors weeks before last frost
BLOOM TIME: Late Spring - Mid Summer
HARDINESS ZONE: 4 - 9
PLANT HEIGHT: 36 - 48”
PLANT SPACING: 12 - 15”
LIGHT REQUIREMENTS: Sun
SOIL & WATER PREFERENCES: Average
Always use sterilized planting soil.
Moisten planting media, place the fine seeds on the soil and cover them lightly.
Stratify the seeds by placing the pot in a plastic bag at approx. 5°C.
After 3-4 weeks place the pot to germination temperature, approx. 15°C.
Within 1-? months the seeds will germinate, germination can be very slow.