Most mints you can whack back, they then branch out more = more shoots for more flowers. They will bloom again as long as it isn't freezing. You can even mow them (highest setting) at least 1x in the year, will produce a thicker mat that nothing can get through! I have chox mint by & in my pond..mmnnn I love mowing that down, smells so good!! They actually look nicer cause they aren't so "rangy" looking! Jody