Red Rose Campion is a lovely perennial with dark red flowers that pop in midsummer and put other flowers to shame. With its frequent reblooming, as long as you deadhead, and its ability to thrive in dry areas, red Rose Campion is an easy plant to fall in love with. Hardy from USDA Zones 4 to 10, winterizing red Rose Campion is a must in cold climates. If you want lovely blooms next summer, give red Rose Campion winter protection.
Stop watering your red Rose Campion in the fall, if you water it at all.
Test your soil's pH. If your soil is too acidic, lower than 6.5, add lime to the soil and work it in around the base of the Rose Campion to a depth of about 4 or 5 inches.
Deadhead any remaining flowers. Collect the Rose Campion seeds and plant them in your garden now, if desired.
Cut off any dead foliage at the base of the Rose Campion.
Trim back any dead foliage about 4 to 6 inches from the base of the Rose Campion. Allow the rest of the plant to die back naturally.
Place mulch over the Rose Campion after the first frost. If you live in a climate that does not get snow, mulching is not necessary.