They did have ready access to corn and rye, which they used to produce their whiskey.
en.wikipedia.org It could be used to grind wheat, oats, barley, rye, and buckwheat into flour and meal.
en.wikipedia.org Crops mainly barley with some wheat, rye, oats, peas, vetches, hops and occasionally hemp.
en.wikipedia.org La fundamental economic base is agriculture, especially dry, which is grown on a fallow grain, alternating wheat with rye, almonds and vines.
en.wikipedia.org It was not until the 18th century that it became common practice to make leavened rye breads; sourdough was mostly used.
en.wikipedia.org