Bountiful Gardens

Calibrachoa: A Million Bells of Non-Stop Color

Calibrachoa, known almost universally by its common names Million Bells or Superbells®, is a flowering powerhouse and a staple of modern container gardening. This plant produces a seemingly endless cascade of small, petunia-like, trumpet-shaped flowers that are so prolific they often completely obscure the foliage. While closely related to the petunia, Calibrachoa is a distinct genus celebrated for its smaller, more weather-resistant blooms and its exceptional trailing habit. The color range is simply breathtaking, covering every shade imaginable from vibrant hot pinks, purples, and reds to sunny yellows, oranges, and even rich terracotta, often featuring stunning patterns like stars, veins, and colored throats.

Why Calibrachoa Reigns in Containers

Calibrachoa's meteoric rise in popularity is due to its nearly perfect suitability for hanging baskets, window boxes, and pots.

Incredible Flower Power: As the name "Million Bells" suggests, these plants produce an astonishing number of blooms, creating a torrent of color from spring until a hard frost.

Self-Cleaning: Calibrachoa requires no deadheading. The spent flowers drop off cleanly on their own, making it incredibly low-maintenance.

Weather Resistant: The small flowers shed rain easily and are less prone to turning to mush in a storm compared to their larger petunia cousins.

Stunning Color Variety: The sheer number of colors and patterns available allows for endless creativity in container design.

Attracts Hummingbirds: The trumpet-shaped flowers are a favorite of hummingbirds and are also visited by butterflies.

When to Plant:

The ideal time to plant Calibrachoa is in the spring, after all danger of frost has passed, typically from mid-May onwards. This gives them time to get established before the summer heat kicks in.

All summer is a perfect time to buy healthy, established plants to create new, vibrant containers or to replace any earlier-season annuals that may be fading. 

Growing Instructions:

Sunlight: Plant in full sun for the most prolific blooming. A minimum of six hours of direct sunlight is recommended.

Soil and Drainage: This is critical. Calibrachoa must have excellent drainage. They are very susceptible to root rot in heavy, soggy soil. Always use a high-quality, fast-draining potting mix for containers.

Watering: They prefer consistent moisture but do not like to be waterlogged. Water thoroughly when the top inch of the soil feels dry to the touch.

Fertilizing: This is the secret to success. Calibrachoa are heavy feeders. To support their massive flower production, they need to be fed regularly. Use a balanced, water-soluble fertilizer at least every two weeks, or use a slow-release fertilizer mixed into the soil at planting time. If the leaves start to look yellow with green veins (a condition called chlorosis), it's often a sign of an iron deficiency, which regular feeding will prevent.

A Modern Horticultural Success Story

Calibrachoa is native to South America, hailing from the same region as its cousin, the Petunia. For a long time, it was considered a species within the Petunia genus. It was named in the 19th century in honor of Antonio de la Cal y Bracho, a Mexican botanist and professor of pharmacology.

Despite being known to botanists, the plant remained in relative obscurity until the late 1980s. It was the Japanese beverage and horticultural company, Suntory, that revolutionized the gardening world by breeding and introducing the first modern, well-behaved Calibrachoa series called 'Million Bells' in the early 1990s. This new plant was an instant sensation, offering gardeners a petunia look-alike that was self-cleaning, bloomed prolifically, and held up better in the rain. This incredible breeding success kicked off a new era in container gardening, and today, Calibrachoa is one of the top-selling annual plants in the world.