According to the Royal Horticultural Society (RHS), the best time to water roses is in the morning to prevent fungal diseases such as mildew and black spot. Morning watering allows the foliage to dry out during the day, reducing the risk of these common issues.
Why Morning Watering Is Recommended
The RHS advises that watering in the morning gives leaves time to dry, which helps ward off fungal infections. Milder morning temperatures also reduce water evaporation, ensuring more moisture reaches the roots. Watering during the hottest part of the day can leave droplets on leaves, causing burns and scorching.
Alternative Watering Times
If morning watering is not possible, late evening after sunset is the next best option. However, the RHS warns that evening watering may attract slugs, which can damage other plants in the garden.
Proper Watering Technique
The RHS emphasizes directing water onto the soil around the base of the plant, avoiding foliage and flowers. This method helps deter fungal diseases and prevents water waste. Established roses should be watered once weekly during dry periods with a thorough soaking rather than light, frequent watering.
Additional Care Tips
Roses are deep-rooted plants that need consistent moisture, especially in summer. Container-grown roses lose water faster and may require more frequent watering. Signs of water stress include wilting, lackluster leaves, and poor growth. Regular feeding throughout the growing season can also extend flowering.
As the RHS stated: "When watering, direct the flow onto the soil around the base of the plant, avoiding the foliage and flowers. This also helps to deter fungal diseases and avoid excess water use."
