Every date palm has a protected area as far as the reach of its fronds

It is narrated from Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him), concerning one, two or three date palms over whose rights people were disputing, ruled that "around each tree, a space equal to the spread of its branches will be counted as its protected zone (harim) (that is, that space will be regarded as the property of the tree's owner)."
This hadith is sahih al-isnad (authentic in its chain), but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sa'id bin al-Musayyab (may Allah have mercy on him), who traces it back to the Prophet (peace and blessings be upon him), that he (peace and blessings be upon him) said: "The protected zone (the safeguarded area around it) of an ancient well ('adiyyah) is fifty cubits, and the zone of a newly dug well (badi) is twenty-five cubits."