Kale and Collards-Some of the Cold Hardiest Vegetables in Existence Kale and Collards are probably the earliest cultivated variations of the European wild cabbage. Kale is known to have been widely grown by both the Greeks and the Romans. From a scientific classification point of view, kale and collards are considered to be the same plant – just two different varieties. Sometimes collards are described as a kind of kale. However, diehard Southerners will tell you that collards are collards and kale is kale and they are very different. Kale, also known as Borecole, and collards are non-heading, leafy greens that are among the most cold-hardy vegetables grown. Kale is definitely a cool season crop whose sweet flavor is substantially enhanced when the plant is exposed to several
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