Superbells® Cardinal Star™ Calibrachoa

Superbells® Cardinal Star™ is a mounding, trailing calibrachoa whose red flowers carry a distinct yellow star at the center. Proven Winners gives a mature range of 6–12 inches tall and 12–24 inches wide, with flowers across spring, summer, and fall. The plant works well in patio pots, hanging baskets, and sunny borders where its contrasting pattern can be seen. ## Form and flowering This cultivar has green foliage and a cascading habit that softens container edges. The yellow star is a defining part of the flower pattern, so the bloom is best described as red with yellow rather than assigning a single color alone. ## Growing conditions Provide full sun or part sun and fertile, moist, well-drained soil. Proven Winners lists USDA zones 9–11. Calibrachoa is a tender perennial usually grown as a warm-season annual where winter temperatures fall below its hardy range. Containers dry more quickly than garden beds; steady moisture and good drainage support continued flowering. Extension sources recommend regular feeding and indicate bloom may continue until frost. Sources: [Proven Winners cultivar profile](https://serv3.provenwinners.com/plants/calibrachoa/superbells-cardinal-star-calibrachoa), [Illinois Extension](https://extension.illinois.edu/flowers/calibrachoa), [NC State Extension](https://plants.ces.ncsu.edu/plants/calibrachoa-x-hybrida/). ## Maintenance Water when the soil surface begins to dry and allow excess water to drain. Feed regularly during active growth, especially in pots. Deadheading is not required; trim stems if they become uneven. Treat as an annual in cold-winter regions or protect from frost where overwintering is feasible.