Talha bin Ubaydullah reported,

I passed by some people with the Messenger of Allah ﷺ who were atop palm trees. He asked, "What are these people doing?"They replied, "They are pollinating them, placing the male into the female so it bears fruit."The Messenger of Allah ﷺ said, "I do not think that accomplishes anything."They were informed of this and abandoned the practice. When the Messenger of Allah ﷺ was told what they had done, he said, "If it benefits them, let them do it. I only voiced an opinion, so do not hold me to account for my opinion. But when I tell you something from Allah, take it, for I will never lie about Allah ."

عن موسى بن طلحة، عن أبيه قال

مررت مع رسول الله ﷺ بقوم على رؤوس النخل، فقال: ما يصنع هؤلاء؟ فقالوا: يلقحونه، يجعلون الذكر في الأنثى، فيلقح، فقال رسول الله ﷺ: ما أظن يغني ذلك شيئا، قال: فأخبروا بذلك فتركوه، فأخبر رسول الله ﷺ بذلك، فقال: إن كان ينفعهم ذلك فليصنعوه، فإني إنما ظننت ظنا، فلا تؤاخذوني بالظن، ولكن إذا حدثتكم عن الله شيئا فخذوا به، فإني لن أكذب على الله عز وجل.