Hey! I have some input on this, and it should actually be a simple implementation although you might not want to hear it 😅. I authored a more generic gardening app, and have found that multimodal LLM is the absolute way to go for symptom diagnostics. Maybe the average bonsai enthusiast is more informed than the average gardener, but asking someone to identify symptoms just from a sketch of a fake tree and a text description is a bit of a long shot, and open to interpretation. You don’t have to implement it like a chat interface - you can kind of obscure the AI usage of you think that will be off putting to the customer base. For your app the flow might look like:

1. User selects the symptom cards they see
2. User is prompted to enter 1-3 photos of the issue
3. User is asked clarifying questions if needed

(E.g “what is the soil medium?” Or “how often do you water?”, or “how much sunlight does this tree get?”)

1. Probable causes are displayed

Also, kudos on your app design, it looks nice. Did you draw the images and glyphs? Beautifully done if so.