- Species and varieties: Calibrachoa, often referred to as 'Million Bells,' is a genus of flowering plants in the Solanaceae family. It is closely related to the petunia and is known for its small, petunia-like flowers. There are numerous varieties of Calibrachoa, including 'Superbells,' 'MiniFamous,' and 'Cabaret,' each offering a range of colors and patterns.
- Hybrid or heirloom: Calibrachoa petunia seeds are typically hybrid varieties. These hybrids are bred for their vibrant colors, prolific blooming, and resistance to diseases. Heirloom varieties are less common in Calibrachoa.
- Pruning and training: Regular deadheading (removal of spent flowers) is recommended to encourage continuous blooming. Pinching back the stems can promote bushier growth and more flowers. Pruning is generally minimal but can be done to shape the plant and remove any leggy growth.
- Fertilization needs: Calibrachoa benefits from regular fertilization. Use a balanced, water-soluble fertilizer every two weeks during the growing season. Slow-release fertilizers can also be used. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Calibrachoa is suitable for USDA hardiness zones 9-11. In cooler climates, they are often grown as annuals or in containers that can be brought indoors during the winter.
- Climate requirements: Calibrachoa thrives in full sun to partial shade and prefers well-draining soil. They require a moderate amount of water, with the soil kept consistently moist but not waterlogged. These plants are heat-tolerant and can handle some drought once established.