Turn Yellow Plant Leaves Green

High PH level in the soil caused by hard water turns plant leaves yellow. To resolve the problem, combine 2 tbs of apple cider vinegar and 1 quart of water, then pour it in the soil as soon as you notice the plant's color change. Do this once a week for 3 weeks. The solution will lower the PH level of the soil by increasing its acidity, correcting the color change.