We recommend watering your new plant until it is fully established. Calibrachoa is drought-tolerant and does not suffer if its soil dries out slightly. However, they do prefer to have evenly moist soil. Be very careful not to overwater your plants because it will cause their roots to sit in standing water and that can cause root rot. Check your plant's soil every so often and if you notice it is dry to the touch, it is time to water.