I was frustrated with the one hour wait for a mature plant in the fast speed, particularly in the first tier of plants. The game could vary the maturity rate by the type of seed or soil used. I'd like the nursery to be a side window to the main page. You could select the plants you want to sell, they would show in the nursery, and you could monitor those fragile plants or change the asking price on the nursery plants. I'd like to select the pot specifically without the whole fill with dirt/trash step, maybe even a mini game section for designing pots--color, design, hanging/clay/urn/bedding tray etc.

A spin off/mini game could be Nursery Tycoon where you could go from small shop to wholesaler to big retail based on the dollar amount/volume sold. After so much in revenue, you could afford to hire a highschool student, a plant expert, have seminars for customers, etc.