Salim narrates from his father (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sells date palms after they have been pollinated, their fruit belongs to the seller, unless the buyer makes it a condition."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10577