MILLERSBURG, Ohio—In a warehouse outside of this village in Ohio’s Amish Country, Brenton Wengerd walks along aisles of shelves stocked with 700 varieties of seeds that range from fruits, vegetables, and herbs to flowers, ancient grains, and cover crops. A day earlier, his company—Berlin Seeds—co-hosted the second Food Independence Summit, where gardening and homesteading enthusiasts…

WALNUT CREEK, Ohio—Amid the rolling green hills of eastern Ohio, Amish and Mennonite farms dot the landscape along roads traveled by horse-drawn buggies and automobiles. Here, self-sufficient living is a way of life. This is a reason why the Food Independence Summit has already become one of the country’s largest sustainable living events where experts…