First, the dream appeared: the big pool, the big tree, and you.
The event is that you plant trees in a big pool.
Then let's analyze this matter. In reality, it is impossible to plant trees in a big pool, which is totally unreasonable. Since it is unreasonable, this unreasonable point is the focus of your dream interpretation. We need to find out why you want to plant trees, or plant trees in a pool, and it is still a big pool.
In fact, I talk so much nonsense because I can't interpret dreams at all.