I found a mint plant in a friend's yard. It's very tall. There are three individual stalks. One is nearly two feet tall, the other two a bit under half that. The big one is fully flowered. The large plant has no leaves on the bottom half of the stalk. What should I do to nurse it back to health? Should I cut the big one in half?
Mint: Prune hard. New branches will start from the axils. (place where leaf attaches to stem)
With the prunings:
Take cuttings 6-8" long. Put in water. Set in cool but cloudy bright place. (North facing porch or window works. If you house is dry put a bag over the container.
They will root in a few weeks. Pot up.
As they grow, pinch the tip every time it does another 3 inches. This will keep them bushy and attractive.