My thoughts,
The idea is awesome, with good marketing, phone apps, it will work, I think it is a great idea.
You should include a calendar showing in a year which vegetable grow best, with image and tutorial for kids.
People like ancient vegetable as well, there are so many forgotten or unknown !
Actually, I thought about mix greenhouse growing and conventionally grown, to be able grow vegetables a whole year.
You forgot to mention your location, it is a good idea but only for a certain country and your clients should be in the same country where the program is operating, I have not heard or read this kind of idea before, since you are the first who brought it, might as well make a patent for it, if it allows to be patented.
Eastern Europe. And yes, that what I was thinking about it, services will be available locally at the start.