Why do some of our rhodo’s leaves go yellow, orange or red?

There is nothing wrong with your rhododendron unless all the leaves are changing colour. It is a very normal part of the lifecycle of the rhododendron for leaves to discolour and fall off. This happens after a leaf has been on the plant for 3 years. It is normal and there is nothing wrong with your rhododendron and you can’t do anything to fix it. Some times of the year it is more noticeable and often it is noticed because it is just a few leaves changing colour. If you want a second opinion then email a photo of your rhodo to [email protected] and we will take a look.

If your whole rhododendron is changing colour to a pale green or yellow then you definitely need to address a nutrient deficiency.