Bishr bin Asim and Uthman bin Abdullah bin Aws (may Allah have mercy on them both) say that Sufyan bin Abdullah al-Thaqafi (may Allah be pleased with him), who was his governor over Ta'if, wrote to Sayyiduna Umar (may Allah be pleased with him). He wrote that in his area there were orchards containing grapevines, and containing peaches and pomegranates whose yield is many times greater than that of the grapevines; and he wrote seeking his instruction regarding the tithe ('ushr) on them. Sayyiduna Umar (may Allah be pleased with him) wrote back to him that there is no tithe on them, because they are all among the thorny shrubs ('idah), so there is no tithe on them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7454