Can be mis-identified as : Three-Cornered Garlic (Allium triquetrum) which also has a stem that is triangular in cross-section and is a similar height, but the flowers are far more numerous and sturdier (rather than flimsy) and have a green stripe down the centre of each petal. The leaves are also narrower than those of Few-flowered Garlic.
Some similarities to : Crow Garlic (Allium vineale) but that has one very-narrow leaf (rather than broadish and grass-like) and at 1.2m high is much taller on a round (rather than triangular) stem and has brown/purplish bulbils and pink to reddish flowers which have stamens longer than the petals and which therefore poke out from the top of the flower.
Slight resemblance to : Field Garlic (Allium oleraceum) which at 80cm is shorter that Crow Garlic but longer than Few-flowered Garlic. Field Garlic has similar-coloured flowers and the stamens are shorter than the flowers (as they are in Few-flowered Garlic) but like Crow Garlic has round stems rather than triangular.
Uniquely identifiable characteristics
Distinguishing Feature :
It grows from a small bulb. It is a rampant invasive weed carpeting the ground in some parts of the UK and is thus listed on Schedule 9 of the Wildlife & Countryside Act (1981) as being illegal to plant in the wild. It is native to the mountain regions of he Caucasus and Iran. In the UK it is naturalised in some coniferous plantations and in woods, grassy places, rough ground and waysides.
Just like Wild Garlic (aka Ramsons, Allium ursinum) a garlic-like odour emanates from large groupings such as are want to gather near riversides or on canal-banks. There is only one (long and narrow) leaf per plant; count the leaves and you know the number of plants. Just like Ramsons it is edible and can be eaten raw or in cooked dishes such as pesto.
It is found mainly in the East of the UK, mostly around dense centres of population. There is a similar, but not identical, cultivated version that is grown in gardens, but that is without bulbils so is less able to spread.