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PlantSnap
Plant Care
Round-headed leek
(Allium sphaerocephalon)
Also Known As
Round-headed leek, Drumstick allium, Firework onion
About This Plant
Allium sphaerocephalon is a bulbous perennial plant species native to Europe and Asia. It produces small, oval-shaped bulbs and long, thin, grass-like leaves. The plant grows up to 2 feet (60 cm) tall and produces a single, upright stem with a small, round, purple flower head at the top. The flowers bloom in the summer and attract bees and other pollinators.
Plant Care Instructions
Outdoor Size Range
Up to 2 feet (60 cm)
Light Requirements
Allium sphaerocephalon prefers full sun to partial shade (at least 6 hours of direct sunlight per day).
Humidity Needs
Allium sphaerocephalon prefers moderate humidity levels (around 40-60%).
Fertilizing Schedule
Fertilize the plant once a month during the growing season with a balanced fertilizer.
Pruning Guidelines
Remove the flower heads once they have faded to prevent the plant from self-seeding. Cut back the leaves once they have turned yellow and died back.
Common Pests and Diseases
Allium sphaerocephalon is relatively pest-free, but may be susceptible to onion thrips and onion maggots.
Indoor Size Range
N/A
Watering Schedule
Water the plant regularly during the growing season, keeping the soil consistently moist but not waterlogged. Reduce watering in the fall and stop watering completely once the leaves turn yellow and die back.
Temperature Range
The plant is hardy in USDA zones 4-8 and can tolerate a wide range of temperatures, from as low as -30°F (-34°C) to as high as 100°F (38°C).
Growing Season
The growing season for Allium sphaerocephalon is from spring to fall.
Growing Difficulty Level
Allium sphaerocephalon is relatively easy to grow and requires minimal maintenance.
USDA Hardiness Zones
USDA hardiness zones 4-8
Did You Know?
The flowers of Allium sphaerocephalon are edible and have a mild onion flavor. They can be used to add a unique touch to salads or as a garnish for other dishes.
