Fluffy tree- can't think what it's called!

Went to Wisley Gardens today to see the butterflies again. It was freezing cold (well about 3.5C) and dull and damp but I still got a few good photos. Took about 50 (about 40 of which have been deleted) in the hope of getting something worth blipping and this was actually the 1st photo I took!

Got a couple of decent butterfly ones but I don't they are as good as the one I took when we were there on 30th Jan so I've gone for this instead.
I've put them plus another couple on here though if anyone is interested Picasa web album