Giant allium (Allium giganteum)
Care, watering, light and tips for Giant allium on Floravia.
Quick facts
- Family: Amaryllidaceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
- Toxicity: Toxic to pets
About Giant allium
Allium giganteum, commonly known as giant ornamental onion, is a spectacular perennial bulbous plant that produces vibrant purple flower spheres atop tall stems in late spring and early summer. Its spherical inflorescences can reach up to 20 cm in diameter, creating a dramatic visual impact in the garden. It is ideal for flower beds, borders, or as a focal point in cottage or contemporary garden designs.
Native range
Central Asia
Care tips
It requires full sun for optimal flowering and prefers well-drained soil rich in organic matter. Water regularly during the active growing period, but reduce watering once the foliage begins to yellow. A common mistake is planting it in heavy, poorly drained soils, which can lead to bulb rot.
How to save a dying Giant allium
- Warning signs
- Yellow/brown leaves, soft stem, no bloom.
- First aid
- Check drainage, reduce watering, move to partial shade if intense sun.
- What kills it
- Overwatering and poor drainage cause bulb rot.
- Can it be saved?
- Yes, if the bulb isn't totally rotted. Remove damaged parts.