I've attached the following pic for reference.
I have a plum tree that's about 6 years old and stood about 3 metres tall.
Anyway, it fell over last night. The ground does not seem disrupted through - so no roots sticking out. I'm not sure what I need to do - can the tree be saved? Can I just try to lift it up so it's standing straight again? How can I keep it from falling over again?