1) It would be nicer if you could double click on the seeds produced to send them to the seed box or the trash rather than having to drag them across the screen. It's very tedious when you have 5 seeds per plant from 15 plants and want to maximize your profits.
2) Instead of (or in addition to) the "sold" signs in the nursery, you should have a tally of how many plants are left to sell (like in Fish Tycoon). There have been MANY times that I scan the nursery thinking everything is sold and come to find out that one was still left. It's more difficult to sell one plant alone than it is to sell when the nursery is full.
I agree with the suggestion to have the ability to buy more space for plants so that we can grow more than 15 at a time. I also agree that we need a magnifying glass or ability to view one plant close-up at a time.