Sayyiduna Ali (may Allah be pleased with him) says: I went out with the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) did not pass by any tree or stone except that it greeted him (peace and blessings be upon him) with salam.
Al-Tabarani recorded it in al-Mu'jam al-Awsat; it contains the Tabi'i Abu Umarah al-Hayawani, whom I do not know, and the remaining narrators of this report are thiqat (trustworthy).