By Julia Burke, Niagara Escarpment Correspondent “I learned from the school of hard knocks,” chuckles Don Demaison when I ask him about his viticulture education. It’s no joke – after purchasing a farm with a vineyard full of hybrid and native vines, trying to make it as a commercial grower, and ultimately selling the farm only to buy it back and convert it to a vinifera-only vineyard, Demaison’s journey has not been easy. Taste his wine, however, and it’s clear his extensive experience has paid off: he’s producing excellent fruit for his own use and for other Niagara winemakers, and…