And in the earth are neighbouring tracts , and gardens of vines , and green crops ( fields etc . ) , and date-palms , growing out two or three from a single stem root , or otherwise ( one stem root for every palm ) , watered with the same water , yet some of them We make more excellent than others to eat . Verily , in these things , there are Ayat ( proofs , evidences , lessons , signs ) for the people who understand .