my cuboard is full with plants. then some body want to buy black currents and i have no room in my cabinet when i want to buy black current to plant .do i need to sell all my carrots to make room so i can buy black currunts. then what happend if someone wants to buy carrots. can some one give advice please thanks

You should have put this in the questions section, but anyway..........
You have 2 options
1. With a premium account you can buy a second shelf
2. Without a premium account - you can send your produce to yourself by contract, then swap it as and when wimps ask for them.
If you keep doing quests, one reward will help with this inconvenience