I would not change my rating on this app but would like to clarify something basic, visually speaking it is HARD to isolate plant life, there is often just SO much in the background that it's a fundamental flaw in what this app is trying to deliver. It is no fault of theirs, but composing a clean picture of a plant in a landscape is almost impossible. Cameras don't see the way we do. We look at simultaneously simple and complex patterns and can mentally isolate and visualize the whole, the camera simply records light and shadow...there's too great a gap there for now.
I will admit that it's paltry 1.5 out of ten was pretty impressive yet, that even when it missed it missed showing results with similar patterns and characteristics. It's cool and a sign of things to come, but it just ain't worth $5.
I work at a garden nursery and know a thing or two about a thing or two regarding plants. I just bought to supplement what I already know and fill in any gaps, maybe help with scientific names, etc.
First thing I snap is something I know, put it to work, I pick something I think is pretty recognizable, Schefflera arboricola variegated, I wouldn't assume bad photo quality/angle(I have my degree in photographic technology). Aaaand...PlantSnap offers a few suggestions but nothing close.
Next I tried something really distinct, a Phalaenopsis orchid, this time PlantSnap managed to identify it as an orchid, but strangely nothing that was close to the variety of Phalaenopsis it was.
I was super excited about the prospect of this app, but it's just not there yet. YMMV.