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French tarragon is the variety used for cooking in the kitchen and is not grown from seed, as the flowers are sterile; instead it is propagated by root division. Russian tarragon (A. dracunculoides L.) can be grown from seed but is much weaker in flavor when compared to the French variety.
Tarragon must be mulched in the winter to protect it from frost. You can bring it inside for a potted winter vacation, but it may transplant poorly and does require lots of light. Even in warm climates, the plants should be divided every two or three years to assure vigor and flavor.