Sunflowers make cheerful additions to any flower garden, but watering them can be tricky. Their love of the sun and dry conditions means that they need meticulous watering and well-drained soil for optimal growth.
Growing sunflowers need approximately 3 mm (1/8 inch) of water a day, while fully-grown sunflowers need double that. While they are drought tolerant and prefer dry conditions, they can't withstand long dry spells.
To avoid rotting in too much water, sunflowers need to grow in well-drained soil. This allows gardeners to water them more frequently without having to worry about the plants becoming water logged.
Use drip irrigation rather than overhead watering. Splashing water on the flowers can damage their petals. Frequent, light watering tends to promote growth most successfully. If leaves turn yellow or start to drop, it usually is a sign that they need more water.