chlorosis in plants definition - Gardening
A little yellowing is normal on most plants during the growing season. When deciduous leaves turn yellow in autumn, the slowing down of the production of chlorophyll -- the green pigment plant cells ... Chlorosis is a mineral deficiency in the leaf, and it's either caused by lack of minerals in the soil, or the pH is off enough in the soil preventing the plant from taking up the available nutrients and minerals in the soil.
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[FL, long-term problem] Bougies are my most-populous specie in the nursery, yet am plagued by chlorosis (for years, out of things to try :/ ) I bought this loropetalum at a discount with the hopes that I could nurse it back to health. My best guess is chlorosis, but I am not sure exactly why. From the articles I read, it could be that the soil PH is too high (loropetalum prefers acidic soil), it is root bound, or there aren't enough... A plant can exhibit chlorosis symptoms due to nitrogen as well as iron deficiency, but the giveaway is: (1) If the new growth is yellow, while the old growth is green / greener > iron deficiency.
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(2) If the new growth is green, while the old growth is yellow/yellower > nitrogen deficiency. The yellow leaves with green veins look like chlorosis to me. That happened to one of my bougainvillea pretty severely and I could not figure it out for a while. I finally read that it can occur from lack of iron or magnesium. Also from compacted soil with poor permeability.
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So I repotted into much better draining soil and added some chelated iron and epsom salt. It took a couple weeks but it ... Chlorosis in the younger leaves usually hints towards an iron deficiency. Iron deficiencies are rare, so my guess is that there's something off about the soil pH.