Symptoms of nutrient deficiency
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Symptoms of nutrient deficiency include yellow leaves and poor growth.
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Iron chlorosis (leaf yellowing with green veins) is the most common nutrient deficiency. Acid-loving indoor plants like gardenias are prone to this.
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The remedy is applying a chelated iron product according to the label directions and acidifying the soil using a sulphur product. Look for a product labeled for indoor plants or houseplants.