Post-Industrial Alder

One of my favourite spots in the centre of Bristol, Alders have colonised these rotting wooden piles around an old swing bridge. No doubt their roots provide a nice habitat for fish and invertebrates too. It's lovely to see how trees take root wherever they are allowed to. Will all of this be first again one day? Who can say for sure?

I'm not sure whether they are the native Alnus glutinosa or Alnus cordata which I'm told is used as a street tree locally due to it's tolerance of pollution.

I haven't managed much blogging in the past two and a half years (my growing family has seemed rather more important than either bonsai or natural history), but it would be nice to start again.