Grape Hyacinth or Muscari
are in full flowers at the moment
They give a lovely patch of spikes with dense blue flowers.
Muscari is a genus of perennial bulbous plants native to Eurasia that produce spikes of dense, most commonly blue, urn-shaped flowersresembling bunches of grapes in the spring. The common name for the genus is grape hyacinth (a name which is also used for the related genera Leopoldia and Pseudomuscari, which were formerly included in Muscari). Other common names are baby’s breath[1] andbluebell,[2] although these are also used for other plants, particularly Gypsophila and Hyacinthoides (respectively). A number of species of Muscari are used as ornamental garden plants.
http://en.wikipedia.org/wiki/Muscari