1 in 3 U.S. households now grow their own food, and it’s easy to see why. Fruit, vegetables, and herbs that come from your own garden are superior in virtually every way: they’re more flavorful and nutritious than store-brought produce, and can even slash grocery bills. On average, a 600-square-foot garden yields around $600 of produce per year. But while summer may be the prime harvesting time, that doesn’t mean your garden has to go dormant come fall. With some careful planning — wh...