Blackthorn, blossom and stitchwort...
Blackthorn has to be my favourite spring blossom - it's amongst the earliest and comes out before its leaves. Blackthorn is in full force now, especially were the hedges are not cut every year (it flowers on the old wood). One of my ambitions is a full length blackthorn / hawthorn south-facing hedge. I'm working on it, planting some sloes last year that are just coming up. But I think my full plan is a few years off!
Cherry blossom is out too - not much good for fruit but the birds will love them later.
And then there's the delicate flower of stitchwort along the hedge bank - a true sign of a Devon spring.