This is a paid asset, but now you can download Easy trees pack (mobile) Free.
Detail this asset from Unity Store: Original Link
Easy trees pack (mobile) v1.0
“If possible, please buy the package to support the developer”
A set of trees and shrubs for a mobile game that uses a medium or long-range plan. (Strategy, RPG and other)
1 texture atlas.
Does not work with the wind!
Not suitable for close plans.