I grow perennials as much as I can. Replanting flowers every year just takes too much time. I think this red flowering plant is a variety of Lemon Balm. It flowers twice a year. I whack it way back when it gets leggy and it always rebounds. The stems have a distinctive smell when cut.
That's Oxalis in the background. It, too, flowers twice a year. Each plant looks like a big mound of clover. When it gets shaggy I cut off as much as I can, leaving a mound of short stems. New leaves grow back quickly in warm months.