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Collards trees grow in temperatures as low as 20 degrees Fahrenheit, and they grow well in containers that can be kept indoors for the winter in colder climates. They may also be cultivated as an annual and propagated by taking cuttings in the fall, rooting them inside, and replanting them in the spring. Tree collards, like their collard siblings, survive heat better than other brassicas and may be picked at any time of year. Read more