Several years ago, while at the garden center, I made the random decision to purchase a tarragon plant. I had never used tarragon in a recipe but thought it might be nice to have on hand. These are the sorts of decision you make when plants are priced very low. Tarragon has a sort of licorice-y aroma and is popular in French cooking. Tarragon vinegar is a very common ingredient in salad dressing. Ina Garten uses tarragon quite a bit.
Much like the thyme plant we have, the tarragon grew rapidly and soon overtook the bed it was planted in. It was the first plant I uprooted and moved to another location, figuring since I kind of hadn't used it yet, there was no real risk. If it didn't make it, so what?
Several years later, the tarragon is flourishing.
It gets along well with its neighbors in the row of herbs I've planted and transplanted along my deck:
It also appears to have multiplied. When I was cutting it back the other day I noticed that we seem to have five plants instead of just one: