Azalea trees grow the same tree each time when bonemealed.

Summary
When you're growing an azalea into a tree, it always has the same tree shape, regardless of rotation. This is different from Java's Azalea trees, where they don't always have the same tree shapes and sizes.

Step to Reproduce
1. Place an azalea or a flowering azalea
2. Bone meal it.
3. Repeat it a few times.
---> You notice that the tree shape are the same.