I have this plant growing in my garden, with a plum like fruit. Could you please tell me if this fruit is edible? Thank you.
It may be a blackthorn tree whose fruits are relished by birds. Do not eat anything unless you are certain of its identification. I suggest taking a branch to a local agricultural group or a nursery, especially a native plant society or nursery to try to get an exact identification.
Only come on in the last month or so. The tree usually delivers a good harvest of plums. Location is north London.
This appears to be a serious problem, since these mushroom-like formations represent the outgrowth of a disease that already exists within the tree. It's called "fungal fruiting," and I'm not sure if the tree can be saved once this has started. However, I strongly recommend that you contact a certified arborist in your area who can help you determine whether the fungus can be controlled or eradicated, or if it's going to be fatal to the tree. We wish you the best of luck with this. Here's some reading material: