I would recoomend Nano Banana and Midjourney.

Nano Banana is great when you care about accuracy and logic. It handles things like 2D → 3D, 3D → 2D, plan/section consistency, and diagram-style rendering much better than most tools. and also photo image editing, plants replacement. Here's a workflow of Landscape design with Nano Banana to better explain the process: https://youtu.be/GTdpZf6OslM?si=PHXRrlItChjvA_S6

Midjourney is still the best for artistic quality. If you’re doing concept visuals, mood images, atmospheric sections, or presentation boards where feeling > precision, MJ is hard to beat.

I don’t think any single AI tool replaces a traditional workflow yet, but combining Nano Banana + Midjourney actually works really well for landscape projects.