wildlife chancers

I have posted at least one of these before but now they are in flower. Two chancers who have found an opening to exploit, a place to live and survive if perhaps not a brilliant place. Its a site I am surveying this year as part of my ecology work, a diversion from my gardening.

There's something about this dog rose growing around an old security lamp post, its something to do with the rose thorns I think, natural security or is that silly?

Then there's this naturally sort of bonsaied elder growing in a thin crack between two slabs of concrete, its trunk has been nibbled by rabbits for years but still it holds on and is full of flower at the moment.