Not that I'd ever buy this but it looks really restrictive in terms of what you can / can't do
Couple of basic hedges, paths and plants. Mowing your lawn and that's about it!?
If I were going to create one of these I'd use the Frontier (Planet Coaster / Planet Zoo) approach where you can raise / lower soil, go to town on trees, lakes, water features, statues and ornaments to create the garden of your dreams. Sure, most people don't have gardens of that size but games are supposed to free us from that reality. From that trailer, it just looks really uninspired and boring.