Is zakat obligatory on dates from inherited palm trees that have not reached the nisab, given that there is another palm oasis on which zakat is paid annually?

Whoever benefits from date palms, and the dates on them do not reach the nisab, but he has other dates, then the dates are combined to complete the nisab. The nisab is five wasqs, which is approximately 612 kilograms; based on the saying of the Prophet, may Allah's prayers and peace be upon him: "There is no sadaqah on grain or dates until it reaches five wasqs." Dates are combined with each other even if their types differ.