In the Garden: Testing pH levels
There are a few plants that people typically have in their landscapes that are very sensitive to pH issues.
Some of these plants include rhododendrons, azaleas and blueberries, which prefer lower pH levels than other plants.
Symptoms of low pH level are shown when leaves turn a bit yellow.
One way to know if the problem is pH and not something else is to do a pH test of the soil. One way you can do this is to buy a kit at a garden store. You can use the kit to take samples and send them away for testing.
You want to take a sample where the roots are growing. You get down around the base of the plant and take a few different samples and mix them together and follow the directions on the kits.