The farmers market used to be more of a summertime thing. When the landscape turns brown and white, our thoughts don’t rush off to the next farmers market. But don’t sleep on—or through—the winter market. The colors of fresh veggies seem all the more vibrant against the grim backdrop of winter, and the flavors are like much-needed tastes of sunshine. I live in Montana, which is about as close to Canada as you can get without a passport, and even there the diversity of produce at the winter market is astounding. Here and now in the middle of a Montana winter, I just ate a glorious salad of local greens that looks like it came straight out of July. We owe this winter bounty to a perfect storm of changes. Warmer temperatures have tilted the growing field toward winter growth, furthered by advances in greenhouse technology, and funded by increasing …