Calibrachoa is a popular garden annual that blooms continuously from planting until frost and is ideal for containers, hanging baskets, or raised beds. These petunia look-alikes offer a wide range of flower colors and patterns that look great by themselves, or when combined with other plants. Calibrachoa will bloom all summer as long as their needs are met. Keeping them happy is relatively simple: The critical elements are sun, fertilizer, soil and water. They perform best in containers with excellent drainage.