I love tree collards! Have grown them at least a decade. In the SF Bay Area, they survived 20F at night for 2-3 days but were not happy. I think they are the best tasting kale, but are best cooked ( red Russian is my favorite raw kale). They need to be renewed every 3 years for best production, from cuttings, which are easy.
In central CA, they don’t seem as happy and I haven’t found the right place yet. Harlequin bugs and bagrada bugs love them too, unfortunately.
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