the Prophet said about Zakat on grapevines: "They are to be assessed just as the date-palm is assessed. Then its Zakat is paid in raisins just as the Zakat for the date-palm is paid in dried dates."
أَنَّ النَّبِيَّ ﷺ كَانَ يَبْعَثُ عَلَى النَّاسِ مَنْ يَخْرُصُ عَلَيْهِمْ كُرُومَهُمْ وَثِمَارَهُمْ وَبِهَذَا الإِسْنَادِ أَنَّ النَّبِيَّ ﷺ قَالَ فِي زَكَاةِ الْكُرُومِ إِنَّهَا تُخْرَصُ كَمَا يُخْرَصُ النَّخْلُ ثُمَّ تُؤَدَّى زَكَاتُهُ زَبِيبًا كَمَا تُؤَدَّى زَكَاةُ النَّخْلِ تَمْرًا