There are several million bell varieties in the Calibrachoa family. They usually grow as rounded plants that reach a height of about 8 to 10 inches high. Some varieties are also trailing varieties that are used as ground covers in small areas. Million bells bloom a multitude of colored blooms, such as violet, pink, blue and yellow, from spring until the first hard freeze in the fall. Plant them outdoors in the spring after the danger of frost has passed.
Choose a spot in full sun and in soil that drains water well to plant million bells. Mix in 2 to 3 inches of peat moss or compost to the top 8 to 12 inches of soil to improve drainage. For clay soil, also mix in equal amounts of coarse sand.
Plant million bells as deep as they were planted in their original containers. Space them approximately 20 to 30 inches apart, depending on the million bell variety.
Water the newly planted million bells with 1 inch of water. Water at the base of the plants rather than from overhead, which can wilt the flowers and cause fungus to grow on the foliage.