All types of mint are fast-growing, spreading plants, so you must give them a place to spread without getting in the way, or plant them in a pot. Mint sends out runners that spread above and just below the ground, quickly forming large, lush green patches. In the right place it makes a pretty seasonal ground cover. Keep plants in check by harvesting the tips regularly and pulling up wayward runners. Mint’s small flowers bloom from June to September; trim these before the buds open to keep the plant compact. Harvest mint leaves at any size by pinching off stems. For a large harvest, wait until just before the plant blooms, when the flavor is most intense, then cut the whole plant to just above the first or second set of leaves. In the process, you will remove the yellowing lower leaves and promote bushier growth.