While most Iowa farmers are just getting a good start at planting their crops, the Phelans in Dallas County have already planted — and harvested — in 2015.

In fact, they’ve already gone through the growing cycle several times this year and will keep it up long past the traditional fall harvest.

To augment growing corn and soybeans, brothers Mike and Tim Phelan, along with their families, built a hydroponic greenhouse a year ago to grow lettuce and other vegetables. Since then, they have found a local market hungry for their Iowa-grown lettuce and other produce.

Currently, about 26 Hy-Vee stores in central Iowa offer Beaver Creek Produce lettuce and herbs, with the distinctive "Grown in Iowa" sticker ...