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www.reference.com/world-view/gardenia-leaves-turn-yellow-b2c86fabb6f3b357

Fixes for yellowing gardenia leaves include cutting back on watering, adjusting the pH of the soil and adding magnesium or iron, according to Gardening Know How. Chlorosis, or the condition that causes yellowing of the leaves, occurs when a plant does not have enough chlorophyll.

www.reference.com/article/leaves-gardenia-turning-yellow-181002f7818e3f4d

The leaves on a gardenia turn yellow when the air temperature is too cold or when the soil does not drain adequately. Yellow leaves also occur when the pH level of the soil is not between 5.0 and 6.5.

www.reference.com/article/causes-gardenia-leaves-turn-brown-b42a618bf5ce132f

There are many reasons gardenia leaves turn brown, including being kept in the wrong climate, not getting enough light, a lack of humidity, pests and fungi. If the brown color is all over the leaf, then it usually means that the leaf is starting to die, whereas a few brown spots signify fungi growth

www.reference.com/article/leaves-turn-yellow-f90751df16b5543

Leaves turn yellow because of lack of water and insects. Chlorosis, root issues, lack of nutrients and lack of sunlight are also culprits that cause yellow leaves.

www.reference.com/article/leaves-start-turning-yellow-717fb730cb1baa79

Leaves start to turn yellow when a plant either receives too much or too little water. Pest infestation, nutrient deficiency or high PH in the soil can also cause leaves to yellow. In some cases, leaves turn yellow owing to chlorosis, a condition where leaves are devoid of chlorophyll.

www.reference.com/article/plant-leaves-turn-yellow-c788071ebb9fb1c9

Plant leaves may turn yellow for a number of reasons, such as nutrient deficiencies, pests, insufficient water or a lack of sunlight. A plant's leaves may also turn yellow as part of the normal growth process.

www.reference.com/article/leaves-plants-turning-yellow-bdbd618b7d255dfa

Leaves of plants typically turn yellow for a variety of reasons, which may include nutritional deficiencies, poor drainage, compacted or damaged roots, overwatering, insufficient light and viral infections. In addition, leaves often turn yellow and drop off of house plants simply as a result of age.

www.reference.com/world-view/vegetable-leaves-turning-yellow-dcebcbbddac166be

Yellow coloring on vegetable leaves can indicate a wide range of problems, including too much water or too little water. Leaves can also turn yellow when the plant is not getting enough nitrogen. Other common causes of yellowing plant leaves include extreme temperatures, leaf damage, root damage, di

www.reference.com/article/reasons-plant-leaves-turn-yellow-da382e106fa5c435

Plant leaves turn yellow for a variety of reasons, including a lack of chlorophyll caused by too much or too little water, insufficient sunlight, temperature changes and disease. Plants contain various pigments such as chlorophyll, which produces a green color, and carotene, which produces a yellow

www.reference.com/article/tomato-leaves-turning-yellow-fe9342cc60a99524

According to Gardening Know How and Home Guides, tomato leaves turn yellow for many reasons, including: a lack of nitrogen in the soil, lack of water, pest problems or magnesium deficiency. Minor yellowing during the growing season or on the lower parts of the plant is normal ? it does not call for