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Farmers don't till close to permanent fruit trees\plants in real life either. It would damage the roots. Instead you top-dress with compost.  If you want to be a little more realistic you could have weeds grow over time that reduce the amount of fertility that is available to the plant requiring a weeding job to clear out. But please don't do that. I hate weeding!  :p

This looks fun. I'll have to try it soon.