I have found French Tarragon very easy to grow. A buddy replaced his annually as it wouldn't come back. He was mulching it in the winter and wasn't using raised soil at all.
When he raised the area a few inches and stopped using mulch it overwintered fine in zone 5 Wisconsin (spring is too wet to use mulch here on things that prefer it dry).
Mine is 3 years old and I just transplanted it into a new raised bed.
Treat it like a Mediteranean plant and you should have good luck with it. Low fertility and low water.
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