Hehe--I don't know what was written into the code (I tend to think logically sometimes!) but I put plants that aren't selling, next to the counter. Also, usually when I'm in the shop, I use the time to do something else on the comp, so I move unsold plants up to the top of the screen so I can see the plants above the other window I'm working in, to know when they're sold. Very unimaginative of me.
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No matter where you go....there you are!