Campanula persicifolia, or peach-leaved bellflower, is a self-seeding perennial with showy purple or white flowers. Campanula has a clumping growth habit, reaching up to 3 feet tall and wide. Often planted in beds and borders, the peach-leaved bellflower can grow well even in cold climates. It grows best in USDA Hardiness Zones 3 through 8, where winters are cold but minimum temperatures don't drop below about minus 35 degrees F. Grow your Campanula persicifolia plants in pots or directly in the ground.
Plant your Campanula persicifolia in moist but well-drained soil with compost added to improve fertility and in full to partial sunlight. Space your plants 1 to 1 1/2 feet apart.
Water your peach-leaved bellflowers once or twice each week to supplement rainfall and keep the soil evenly moist. Ensure that your plants receive about 1/2 to 1 inch of water each week during the growing season.
Feed your Campanula persicifolia once each year in early spring with a 10-10-10 NPK (nitrogen-phosphorous-potassium) plant fertilizer.
Spread a 2-inch layer of organic mulch around the root zone of your bellflowers, keeping the mulch about 1 to 2 inches away from the main stems or crowns.
Cut back your Campanula in early summer when the blooms have begun to fade. This will encourage a second flush of flowers.
Propagate your bellflowers by seed in late summer or by dividing the clumps in the spring or autumn.
Stratify (provide a cold treatment to) your seeds during the winter by storing them in a refrigerator and planting them in the spring.