Your idea sounds very nice and easy when seen by a developer. In reality, everything is much different.
Do you have any experience with Planting and growing veggies? do you know where you will distribute the finished product?

My suggestion to you is to research more about agriculture and obligation there. especially if you're going to have it a whole year. IDK from where you are, also you can investigate in your country, it is possible that there are subsidies because agricultural production can be more expensive than the final product.