Shrubs and using image for...

I was wondering if I plan on doing a slanted hill and making shrubs on it, how would I do this?

also, will an image texture say wood or sand a sculpt in the mesh? what about sculpting a mesh say a plank that has holes.will that smudge the mesh even with edge loops? pics below of what I mean on slanted hill for how to make shrubs on this and a wood texture I would like to sculpt. do i turn it into a alpha?