Like low-maintenance, helpful house-guests having a sense of humor, Campanulas never lose their welcome, that is lucky since this perennial moves straight in and remains for years. Campanula species, commonly called bellflowers, create a low flow of foliage and flowers which can bloom from early spring through autumn. Some, like Campanula poscharskyana “Blue Waterfall”, have starry flowers in lavender-blue. They supply spreading, undemanding ground cover in U.S. Department of Agriculture plant hardiness zones 3 through 9, and stay evergreen in the milder climates. Grow these friendly plants from seed, starting in early spring.
Prepare a garden bed for the bellflower seeds in the fall. Work the soil to 8 inches, mixing in many inches of organic compost. Bellflowers grow in normal, clay or sandy soil, in acid, neutral or alkaline soil, in full sun or partial sunlight. Assess your seed package for any special conditions for the species you select.
Fill trays or containers with a frequent soil mix in the springtime. Surface sow the tiny bellflower seeds by scattering them over the soil. Moisten the soil by spraying for the first few weeks to avoid washing away the seeds. Keep the seed trays in a cold frame in a mild climate, indoors in colder areas. Irrigate often to keep the soil moist. Slim following germination to leave at least 1 inch between atom.
Transplant the seedlings to the permanent garden bed after the last frost, ideally in April. Each plant should be at least two inches tall. Use a trowel to dig holes that give the bellflowers’ roots lots of room to expand. Place seedlings a bit high so the crowns are slightly above the soil level to permit for settling. Press the soil gently around the plant roots. Water well after planting and many times a week for the initial month.
Apply 2 to 3 inches of mulch in late May. Use an organic mulch like chopped leaves. Water the young plants infrequently but deeply after the root system is established and new growth starts. Fertilize twice a month using a balanced fertilizer like 10-10-10 throughout the growing season. After the first time, fertilize once a year, four months before flowering, should you wish a low-maintenance garden.