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PlantSnap
Plant Care
Giant onion
(Allium giganteum)
Also Known As
Giant onion, Giant allium, Flowering onion
About This Plant
Allium giganteum is a bulbous perennial plant species that belongs to the genus Allium and the family Amaryllidaceae. It is known for its large, spherical purple flowers that grow on tall stems.
Plant Care Instructions
Outdoor Size Range
24-48 inches (61-122 cm)
Light Requirements
Allium giganteum prefers full sun to partial shade.
Humidity Needs
Allium giganteum can tolerate a wide range of humidity levels, but it prefers moderate humidity.
Fertilizing Schedule
Fertilize the plant once a month during the growing season with a balanced fertilizer.
Pruning Guidelines
Remove the spent flowers and yellowing leaves as needed.
Common Pests and Diseases
Allium giganteum is generally pest-free, but it can be affected by onion thrips and onion maggots.
Indoor Size Range
N/A
Watering Schedule
Water the plant regularly during the growing season, but avoid overwatering as it can lead to rotting of the bulb.
Temperature Range
Allium giganteum can tolerate a wide range of temperatures, but it prefers cool to moderate temperatures.
Growing Season
Allium giganteum blooms in late spring to early summer.
Growing Difficulty Level
Allium giganteum is relatively easy to grow as long as it is planted in well-draining soil and receives adequate water and sunlight.
USDA Hardiness Zones
Allium giganteum is hardy in USDA zones 5-8.
Did You Know?
Allium giganteum is not actually an onion, despite its common name. It is also known for its edible bulbs, which are often used in cooking.
