Here are some easy tips for how to grow Calibrachoa plants: These plants are winter hardy perennials in some zones but annual plants in others. Calibrachoa plants go into the garden in spring, after the last frost. Use a well-draining soil rich in organic matter. These annual plants grow best in full sun; some afternoon shade is okay. Calibrachoa plants are drought tolerant; over-watering causes root rot.
Common Name(s): Million Bells; Trailing Petunia
Description: They look like regular Petunia plants, with tiny (1-inch) trumpet-shaped flowers in a wide variety of bold colors like chocolate, hot pink, bronze and dark red. Newer hybrids like ruffled double flowers and blooms with a dark ‘eye’ are very showy. Calibrachoa plants have thick, sticky leaves; their small flowers open during the day and close at night. Calibrachoa grows in compact mounds with trailing branches. They grow very fast and the flowers bloom for a long time (spring through late fall.) Depending on the type, Calibrachoa can grow from 5-10 in. tall and spread from 12-24 in. wide.
Propagation: Stem cuttings.
Origin of Plant/Name: Mexico. Plant named after a 19th century Mexican botanist.
USDA Hardiness Zones: Annual plants in all zones; in zones 9-11, winter hardy perennial plants.
Companion Plants: Coral Bells, Creeping Jenny
Fertilizer Needs: Control-release (1 Tablespoon per 1 Gallon water) weekly. If Million Bells plants show yellow leaves, it means these annual plants need iron. Use Miracid to fix pH levels.
Maintenance: Low. Water when top of soil feels dry. Pinch back for bushier look (may not bloom for 2 wks. afterward).
Display: Containers, hanging baskets, window boxes, flowerbed border.
Wildlife Value: Leaves of Million Bells plants draw hummingbirds.
Overwinter: Zones 7-11. Before first frost, bring container into cool room (like a garage). Needs 4-6 hrs. sun daily. Cut back leggy stems. Water once a week during winter; water until liquid drains from bottom. Use general purpose fertilizer once a month. Follow package directions.