Why bother with software? Why not look at your lot and plan in the real world?
What do you want? Do you want the computer to come up with a complete landscape plan? Yaaaaa right! It takes skill and years of experience to even begin to navigate a good landscape program.
Mabye you could call a contractor to do it for you.
Or mabye you might just start your own Landscape buis.?
The programs out there are just little tools to mabye" sell a job" Its all common sence in landscaping. How big does a tree get in 10 years??????? Well look it up. whats the max., a tree will grow.
Go ahead and get into cad! Or even better "punch" Have fun, you may be a land scraper yet

You dont even know how deep the puddle is rhollin.