It could be an error in my game, but plants that grow on a lot never seems to die when my sims have moved to another lot. They can always go back there to harvest new fruit every few days for two generations now. Although the water sprinklers are improved to auto water so my sims don't have to do themself, eventually a plant has to die, right? Well, this one doesn't.
It isn't only counting for one type of plant because I've built a farm on that lot which included all the plants ingame (with the from World Adventures included).
In fact that this doesn't appear only in my game, it could be an improvement to the Gardening Guide.