Clay soils hold moisture during long, dry summers but the hard surfaces, combined with sloping contours, allow heavy rainfalls near harvest time to run-off without absorption - a critical point when grapes are already ripe.
For a better understanding of the soil types in relation to Waiheke's vineyards, view the interactive
Soil Map of .
Visit also the
Geological Map of which plots the location of vineyards relative to the underlying rock formations.