pH - bringing back to neutral from Alkaline
If the pH of your soil is too alkaline then you may want to bring it back to a natural 7. To correct this you need to make your soil more acidic. Here is a list of ingredients that can each be used to return your plants PH to 7.
✓ Cottonseed meal
✓ Lemon peels
✓ Ground coffee
✓ Some Fertilizers also are very acidic and can bring the pH down to 7
When using this method always moderately apply the substance and check the pH. Over time you will know what measures to use. This is best left up to the grower as he/she will know how big their pot is and how much should be added. Experiment a bit and learn as you go along.