Hi Margaret, fruit falling off is a stress sign and most often it is a lack of moisture at the critical time (Satsuma varieties often need that little bit of extra water during the hot months). Sometimes if a mandarin has too much fruit it will drop some. Ensure some deep watering is done during the hot months. It will also help to apply some BioGro certified Organic Plant tonic (seaweed, compost tea or fish tonic). Thanks, the Palmers team
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