I did a funeral at the Greenwood Burial Ground at Farnham, near Saxmundham in Suffolk, today. It's unlike the other green burial grounds near here.
Most of the trees are already established and the graves are dug between them. In other green burial sites, the trees are planted on the graves in the autumn, so a new-ish site can look rather bare for a few years.
I used to think that doing it this way, with the graves so close to the trees, might damage them, but the gravedigger said it doesn't harm them. It's like pruning the trees, only underground, and they grow new roots. I'm not convinced but haven't noticed any dying off.