Answer: It is quite possibly catnip (Nepeta cataria) which is a member of the mint family. This plant will grow in full sun or light shade and prefers a well drained soil. It spreads rapidly both from the base and by seed, so you may not wish to allow it to set seed. Harvest during summer, then cut it back in the fall after frost has nipped it. It is very winter hardy and has no particular pests or problems. Ultimately the plant will grow somewhere between 18 and 36 inches tall and its width will depend on how far you allow it to spread.
All in all, it is quite easy to care for as long as cats don't destroy it in the garden! Enjoy!
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