I think that AchiCAD is a very good software for landscape architecs. The plans of 2D looks very well, it has many 3D objects including plants, peoples etc. and you can make render with 4 different engines. Also,you can export for ARTlantis for rendering.
Another important software is Vectorworks. I didn’t work in it by now, but I saw projects made with it and I was impressed.
All the best.
Cristian
