Answer: It sounds as though the root system of the lighter colored one is suffering. Perhaps from overcrowding and being girdled by the roots of the second tree. You might be doing them both a favor by repotting them individually. This way they won't have to compete for moisture and nutriens. It may be difficult to separate the trees if they have always been growing together but it can be done. Start by gently removing as much of the potting soil as possible and then swishing the root systems in a large container of water. The water will usually help untangle the roots. You may need a helper for this part of the project. After separating the trees pot each up in fresh potting soil and water them well to help settle the soil. Best wishes with your trees.
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