How gardeners in cold climate cities unlock fresh home grown greens deep into autumn and winter, even after the first frost arrives?
Living and gardening in Berlin (52.5°N, USDA zone 7a/7b), I have learned that autumn is not the end of growing season — it marks the start of something special. Under temperate continental climate, September still brings 20°C daytime warmth, yet nights drop sharply toward 10°C. By late October, the first


