excellent article. we grow great garlic here in teton county, one of the coldest valleys in WY.Even with global warming we get spells of -30-40 but we mulch with 6-12"straw after planting Oct 15 every year which provides the benefits described above but has the added bonus of allowing the earthworms to stay high in the soil, just under the mulch. They till the soil all winter! The german extra hardy is a superb variety. We pull the straw after the last frost to get soil temps up, our summers are cool. we keep the biggest cloves as seed stock and rotate beds to prevent disease.
Garlic is one of my favorite things to grow, and each year the number of cloves planted in our garden increases. In the past seven years, varieties grown (5b) have been Chet's Italian Red, Chesnok Red, Georgian Fire, German Extra Hardy, Inchelium Red, and Persian Star. The ones I enjoy and have grown most are Chet's Italian Red, Georgian Fire, and Chesnok Red. A new variety growing in our garden this year is Spanish Roja. This year's harvest should yield seventy-seven bulbs of garlic. Woo-hoo!