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Jun 22, One problem that plagues gardeners is a gardenia bush with yellow leaves. Yellow leaves are a sign of chlorosis in plants. There are several causes and trying to determine the reason can involve a lot of trial and error. What is Chlorosis in Plants? Chlorosis in plants simply means that the plant doesn’t have enough chlorophyll. This can be caused by poor drainage, root problems, pH too high, not. If your Gardenia's leaves turn yellow and drop, aside from the normal aging process of its leaves, this may be caused by any of these reasons: Over-watering or under-watering: Gardenias need at least 1 inch of rain (or equivalent watering) each week.

Keep the soil consistently damp but not soggy. Jun 29, Fertilizing. If you have ruled out incorrect soil pH, poor drainage, and over-watering as possible causes for yellow leaves on your gardenia, then consider yourself lucky. The fourth growing need, sufficient nutrients, is met easily enough if such nutrition has been lacking. Simply fertilize. Watering the gardenia using normal tap water may cause yellowing of its leaves, since tap water is mostly hard, containing calcium present as limestone.

Also, water runoffs from concrete, being alkaline, can affect nutrient uptake, causing chlorosis and yellow leaves. On the other hand, using soft water is not advisable since it contains bushcutting.barted Reading Time: 7 mins.

Jul 25, A frequent question asked by most gardeners is “ what causes yellow leaves on gardenia bush ” Below are some of the reasons for the yellow coloration of your gardenia plant leaves. #1 Nitrogen The deficiency of nitrogen results In very crippled, wiry yellow plants or. Several types of root rot attack gardenias, causing above-ground symptoms such as leaf yellowing, wilting and leaf drop. Digging just below the soil surface will reveal brown, rotten roots -- a.