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Hi. Thanks for the message. I would suspect that the yellowing of the leaves is due to lack of fertiliser available to the plants. Watering every day would be making things worse as the water is diluting down any nutrients that would be present in the soil. Yellowing leaves in Photinia can be a result of lack of nitrogen, magnesium or the soil not being acidic enough. I would suggest applying a liquid feed that is marked up as Ericaceous (suitable for Rhododendron and Camellia) as that will act quickly. You can also apply a slow release fertiliser that will break down more gradually with the daily watering. Maybe adjust the amount of water that is going into your plants too. Watering in the morning is always best. Hope this helps you 🌸🌼
