Trees 2.0

Two players compete to build the tallest tree. Players must invest resources gained from the wind, rain and sun wisely, to build their tree. As more stems, leaves and roots are grown, the tree's ability to extract water, sunlight and carbon dioxide from the elements is increased.
The winner is the first player to bear 12 pieces of fruit - the most expensive item to produce. (A devious tactic for the underhand is to attempt to block your opponent by growing right round them.) Good clean, educational fun.