One-Leaved Onion

Allium unifolium

Physical Characteristics

Allium unifolium is a BULB growing to 0.6 m (2ft) by 0.1 m (0ft 4in). See above for USDA hardiness. It is hardy to UK zone 8 and is not frost tender. It is in flower from June to July. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, insects. Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil.

Distribution

South-western N. America - California and Oregon.

Habitats

Cultivated Beds;

Edible Uses

Edible Parts: Flowers Leaves Root Shoots Edible Uses: Bulb - raw or cooked[161, 177, 257]. The bulbs are 10 - 15mm in diameter[200]. Together with the young shoots, they are fried and eaten[183]. Leaves - raw or cooked[183]. Flowers - raw. Used as a garnish on salads.

Medicinal Uses

Although no specific mention of medicinal uses has been seen for this species, members of this genus are in general very healthy additions to the diet. They contain sulphur compounds (which give them their onion flavour) and when added to the diet on a regular basis they help reduce blood cholesterol levels, act as a tonic to the digestive system and also tonify the circulatory system[K].

Known Hazards

Although no individual reports regarding this species have been seen, there have been cases of poisoning caused by the consumption, in very large quantities and by some mammals, of certain members of this genus. Dogs seem to be particularly susceptible[76].