Alliums are a genus of bulbus plants containing over 280 species, many of which are found wild all over the Northern Hemisphere. Allium giganteum is native to the Himalayas and given the right conditions can grow to a height of over 4 ft! The leaves are glaucous and broadly strapped shaped, and they produce these beautiful, deep lilac, star-shaped flowers on impressive 4-5 inch umbels in June.
The giant allium will do best in well drained soil, and prefers a site blessed with full sun. If you are purchasing Allium giganteum as bulbs in the autumn then these can be planted September to October. Just make sure that they are planted a good 3-4 times the depth of the bulb - otherwise the plant may not be able to support the height of the stem and will fall over in strong winds. In exposed sites you may need to consider staking!
Dead-head after flowering, leaving the stem to die back naturally so that the nutrients and carbohydrates within can bulk-up and strengthen the bulb for the following year. Allowing the seeds to ripen will use precious energy, unless you are collecting the seed for propagation.
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