@ciku-karugi Trees generated with the Sapling Generator are already UV unwrapped, so it’s just a matter of changing the scale values in the Mapping node.

About the floating leaves; I don’t think they are floating, it looks to me that all your leaves are rotated 90°. They look attached to the branches from their sides. When using a Particle System, remember that the leaves ‘grow from the Origin point’ of the leaf.
Still, I like you picture!