Calibrachoa is a genus of evergreen perennials that are closely related to petunias. They grow between four and eight inches in height and bloom during the entire duration of summer, usually until the first frost of fall. The flowers can be blue, pink, lavender or coral in color and resemble bells. Calibrachoa produces numerous blossoms every year, earning it the common name “million bells.”
Plant calibrachoa after the final frost of winter in a location that receives full sunlight. Add peat moss to the soil prior to planting to increase drainage and make the soil slightly more acidic, which calibrachoa prefers.
Water calibrachoa plants once a week, keeping the soil fairly moist. This plant is extremely drought resistant and does not require large amounts of water. Increase watering to twice per week during extremely hot weather.
Fertilize once a month using a balanced 10-10-10 NPK fertilizer. Water the soil thoroughly before and after applying fertilizer to release the nutrients into the soil. Follow the manufacturer's directions for proper dosage.
Spread about one inch of mulch over the soil around the calibrachoa to conserve moisture and release additional nutrients into the soil. Refresh the mulch whenever it begins to decompose.
Transplant calibrachoa into a container and move inside once winter begins. Calibrachoa cannot survive in extremely low temperatures but will need a warm, stable environment to continue growth. Replant outdoors after the final frost of winter.