Sayyiduna Abdullah bin Umar (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: "Whoever sells a grafted date-palm tree, the seller is entitled to its fruit, unless the buyer stipulates a condition."
Hadith Referenceالمنتقى ابن الجارود / كتاب البيوع والتجارات / 628