Great Tree
A great tree in full leaf stands for growth and a solid patron. Climbing it means your standing rises, and picking its fruit is a good omen of harvest. Resting in its shade means there is someone to lean on. A tree falling or being cut down, by contrast, signals that what you depended on is shaking, and a bare tree was read as care that falls short of what the thing needs.
A great tree took decades to reach that size, and that slowness is half of the meaning. Traditional reading likened the tree to a household and to a benefactor, and the fuller it stood, the better it read. The state of the tree and what you did with it decide the meaning.
Readings by Situation
Seeing a great tree in full leaf
A good sign that what you lean on is solid. Tradition read a flourishing tree as a household prospering. It is also read as someone arriving to help.
Climbing a tree
A leading good omen of your standing rising. The higher you climb, the better it reads, and reaching the top with a clear view more so. If the branches felt weak, though, read it as a warning against overreaching.
A tree heavy with fruit
A sign that the effort you put in comes back as a result. Tradition read fruit as both children and wealth. It is sometimes read as a conception dream, but circumstances have to be weighed alongside it.
A tree withering or falling
What decides this scene is whether it went over at the root or only a branch dried. A tree grows across many years, so the dream points less at something sudden than at a place left untended for a long time.
Tree dreams are broadly favourable. Seeing a withered tree does not fix anything bad in place. If the climb was hard, look at whether your actual schedule is too heavy.