Is Zakat obligatory on lands acquired for building a future home for children, and how is it calculated if obligatory, and is Zakat obligatory on date palms that have been harvested and distributed as gifts?

Land purchased for building future housing for children is not subject to zakat (definition), nor are buildings prepared for their residence. As for the palm trees on the land, zakat is due on their fruits if they reach the nisab (definition) (five awsuq after drying). One-tenth is due if watered without machinery, and one-half of one-tenth if watered with machinery. If zakat is paid without intention, it is not valid, and the obligatory amount from the fruit or its value must be given if the jurist deems it to be in the overriding interest.