This website and this one will provide you with the research-based answers to these questions. Staking is a temporary way to provide the tree support while the root system gets established.

The chaste, or vitex tree, is a multitrunked, deciduous small tree with a broad, free-spreading habit. The tree typically makes an airy, but dense canopy because numerous side branches grow from ...

Q. I have a young apple tree that is starting to lean. Most of the branches are growing on the south side, the direction in which it is leaning. Is there some way to correct the leaning tree? Also ...

DEAR JANET: I have this lovely deodara cedar that is like 15-16 feet tall that is leaning. Should I worry about it? How would I correct it? Who would I get to correct it?

Bill, I wanted to get your thoughts on attempting to straighten up a leaning Magnolia tree. I planted the tree 8 years ago. Despite putting in two bracing poles, the tree leans over maybe 15 ...

Since your tree is leaning (a sign of root failure) 5 years after planting, I doubt that just staking it will help the underlying problem that caused it to lean in the first place.