Azaleas are a type of flowering shrub that is native to Asia. They are popular garden plants because of their beautiful flowers and easy care. Azaleas prefer acidic soil because it helps them to absorb nutrients from the soil. When the soil pH is too high, azaleas can become chlorotic, which means that their leaves turn yellow.

You can test the pH of your soil with a soil pH test kit. If the pH is too high, you can add elemental sulfur to the soil to lower it. You should also fertilize your azaleas with an acidic fertilizer to help them to stay healthy.