Allium caeruleum
Allium caeruleum
Allium caeruleum

Allium caeruleum

Blue Globe Onion

Alliaceae

Height

60-70 cm

Flower colour

blue

Flowering time

July - August

Foliage colour

green

Sunlight

sun - partial shade

Soil

well drained

pH

acid - neutral - alkaline

Hardiness

hardiness

Plant range

Central-Asia

Allium is a genus in the family Alliaceae. The genus includes onions grown for food, but also a number of decorative garden plants. It is a very large genus with close to 1000 species, most of which are native to the temperate regions of the northern hemisphere.

Propagation:


Bulbs planted in autumn.


Division in spring.


Seed – needs cold stratification, best sown in September - November.

Seed just covered and stored for 2-4 weeks at 20°C (68°F) and then it‘s moved outside until germination. Germination can be slow, seed may germinate a year later, so it‘s important not to throw it away prematurely. Optimum germination temperature is 5-12°C (40-55°F).

A hardy ornamental onion with a globe-shaped cluster of blue flowers. The leaves wither during flowering, so it's best to plant it among perennials with mounding foliage. It grows best in well drained soil.

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