DH - it would be most uncharitable of me to mention the effects that injecting, for example, copper sulphate, under the bark of a tree can have on its life expectancy. So I won't mention it.
I went for a walk along Lathkill Dale. Didn't realise just how many mining remains there are up there. Question for anyone who knows : What was the building which now has the remains of two millstones in it? It seems a funny place to have a mill - I think it's the furthest upstream obvious old building on the true left bank.