Allium caeruleum
blue allium bulbs (syn. Allium azureum)
This stunning blue ornamental onion is ideal for a sunny border, producing dense globes of small, star-shaped, bright blue flowers on stiff, upright stems from early to midsummer.
As the slender leaves tend to die back before the flowers emerge, it’s best planted with other medium-sized herbaceous plants, such as sea holly, which help to mask the faded foliage.
As the slender leaves tend to die back before the flowers emerge, it’s best planted with other medium-sized herbaceous plants, such as sea holly, which help to mask the faded foliage.
How to care for Allium caeruleum:
Allium bulbs are easy to grow in a sunny spot with freely drained soil, or a good quality potting compost. Ideally they should be planted in September or October, but could also be planted in early November in milder regions.
Dig holes roughly three times as deep as the diameter of the bulb and place them at the base, pointy side up before gently infilling and watering to settle them in.
In early spring, as growth begins, apply a balanced, slow-release fertiliser, and allow the plants to die back naturally and completely before tidying away.
Dig holes roughly three times as deep as the diameter of the bulb and place them at the base, pointy side up before gently infilling and watering to settle them in.
In early spring, as growth begins, apply a balanced, slow-release fertiliser, and allow the plants to die back naturally and completely before tidying away.
Flowering period:
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Eventual height:
0.6m
Eventual spread:
0.25m
Position:
Full sun
Rate of growth:
Average
Soil:
Moderately fertile, moist, well-drained soil
Hardiness:
Fully hardy
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Pets: TOXIC if eaten; Humans: Ornamental bulbs - not to be eaten
