WHY IS THERE HAIR GROWING IN MY GARDEN

do you mean actual hair or a hair like green leaf?
a photo would help.

its tufts of what looks and feels like hair.. must be at least 100 2inch high individual soft dark grey shoots in each clump

ref ..hair growing in my borders

I have encountered this in my garden when cats have not buried their poo very deeply and as it decomposes hair grows from it like a mould. The vet says it happens because cats have alot of hair in their bowels from grooming which goes into the soil. If you dig it up you might find this is what it is. Of course it may not be this at all but it sounds very much like what I have had happen in my garden!

if its a grass it will take a little bit to snap it.if not and its fungas it will be brittle

ref hair growing in my borders..... jude 10 ..i think youve got it

give it a short back and sides lol