Certain fruits require cross pollination to set their fruits. Sometimes it is sufficient to plant more than one of the same variety, and other times you must plant a different variety of the same type of fruit to get best results. It is very difficult to generalize which fruits this pertains to. The best approach is to carefully read the catalog or ask the sales person you are buying from whether the plant is self fruitful or requires a different or additional pollinators. If your supplier can't answer this question, buy from someone else. You need a supplier who knows for sure.
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