I will get the obvious 'funny' out of the way first; this species is not silver-hair grass, a form of cannabis for older people, it is silver hair-grass (Aira caryophyllea).
Hair-grasses are so called because the branches that the florets appear on are exceedingly fine, just like hair. In the case of silver hair-grass the whole plant has a silvery colouring as it glistens in the sun but close up it has something of a purple tinge to it. Flowering from May until July it is fairly short grass a that grows on dry, bare patches on sandy or gravelly soils. When the flowers are over they turn white.
It is a very delicate plant and getting a good photograph of it has escaped me so far.