It is a good way to earn some gralats on the side while you're doing side, provided if you do check in on them to see whether the plants are ripe or not. If you are an active player, blueberry crops can get you a lot of gralats over long gaming periods if you constantly collect them every few mins. If not, plant watermelons before logging off since they do take a few hours to grow, but reaps more gralats than usual at the cost of being more expensive to buy.