Your Gardenia troubles may be because of either low Magnesium (which is why you would apply the Epsom salts. Keep this up every 14 days though) or low in Iron or Manganese If your gardenia needs magnesium, this will cause the leaves to turn yellow. You can remedy this with a fertilizer high in magnesium, or you can add some Epsom salts to your soil. Mix one teaspoon to one gallon of water and apply every two to four weeks.This practice isn’t without its critics, however. Some say there is no evidence to prove that Epsom salts help gardenias or any other plants. One the other hand, countless gardeners swear by using this additive for their gardenias and roses. Give it a try for yourself and see if it helps. Low on Iron or Manganese Yellowing leaves can also be caused by insufficient levels of iron or manganese, and this is where a soil test becomes especially useful since the symptoms look the same. Using a balanced fertiliser will remedy this problem no matter which nutrient is missing.
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