Calibrachoa, widely recognized as Million Bells, is a popular annual flowering plant that brings abundant color to various garden settings. Its vibrant, trumpet-shaped flowers, resembling miniature petunias, bloom prolifically from spring until the first frost. This plant is a favorite for its low-maintenance nature and its ability to cascade.
Calibrachoa Care Essentials
Calibrachoa thrives in locations that receive ample sunlight. For optimal blooming, these plants require at least six hours of direct sunlight each day. While they can tolerate some partial shade, especially in hotter climates, insufficient light leads to reduced flower production and leggy growth.
Consistent moisture is important for Calibrachoa, but avoiding soggy soil is equally important to prevent root rot. Water the plants regularly, allowing the top inch or two of soil to dry out between waterings. In containers, where soil tends to dry out more quickly, daily watering might be necessary during hot weather.
The ideal growing medium for Calibrachoa is well-draining soil that is rich in organic matter. For container planting, a high-quality potting mix is recommended, along with pots that have adequate drainage holes. These plants prefer a slightly acidic to neutral soil pH, typically ranging between 5.5 and 6.5.
Due to their continuous blooming, Calibrachoa are heavy feeders and require regular fertilization. A balanced, water-soluble fertilizer applied every two to four weeks during the growing season supports their prolific flowering.
Calibrachoa prefers warm temperatures and is sensitive to frost. It thrives in temperatures between 55°F and 65°F. The plant tolerates a range of humidity levels, but good air circulation helps prevent issues like root rot.
Planting and Cultivation Tips
When selecting a location for Calibrachoa, choose a spot that receives full sun for at least six hours daily. Protection from strong winds can also help maintain the plant’s delicate stems and flowers.
Calibrachoa is highly versatile and performs well in both containers and in-ground settings, though it is particularly popular in containers and hanging baskets due to its trailing habit. When planting in containers, ensure they have proper drainage holes to prevent waterlogging. For in-ground planting, amend the soil with organic matter to improve drainage and fertility.
When planting multiple Calibrachoa plants together, space them approximately 6 to 12 inches apart. This spacing allows for adequate air circulation, which is important for plant health and helps prevent disease.
Calibrachoa is largely self-cleaning, meaning it sheds spent flowers without the need for manual deadheading. However, occasional light pruning, such as pinching back the tips of new growth, can encourage bushier plants and more branching.
Troubleshooting Common Issues
Calibrachoa can sometimes be affected by common garden pests such as aphids, whiteflies, and spider mites. These tiny insects feed on plant sap, leading to symptoms like yellowing leaves or stunted growth. Insecticidal soap or neem oil can be effective treatments for controlling these pests.
Disease prevention for Calibrachoa centers on proper watering and air circulation. Root rot, often caused by overwatering or poorly draining soil, is a common issue that manifests as yellowing or wilting leaves. Powdery mildew, appearing as a white, powdery substance on leaves, can occur with poor air circulation.
Nutrient deficiencies can also impact Calibrachoa’s health. Yellowing leaves, particularly between the veins, can indicate an iron deficiency, especially if the soil pH is too high. Regular fertilization with a balanced product, possibly with added iron, can correct these deficiencies.
Popular Varieties and Display Ideas
Calibrachoa offers a wide array of colors and series, including popular names like ‘Million Bells’ and ‘Superbells’. These varieties come in a spectrum of hues, from various shades of pink, red, purple, yellow, and white, often with unique patterns and double blooms.
The trailing and mounding growth habit of Calibrachoa makes it suitable for many display applications. They are frequently used in hanging baskets and window boxes, where their flowers can cascade attractively over the edges. Calibrachoa also performs well in mixed containers alongside other annuals and perennials, or as groundcover in garden beds and rock gardens.