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Thanks for your answers and advice guys. Alan is an indoors plant and he is usually kept on one of the window ledges that has the most sunlight and sometimes moved to the porch which is unheated but has sunlight and heat through the windows towards the end of the day, as we're in a south facing house. It does get very, very warm in there during the summer and Alan has spent most of his formative years in there. Any ideas what the yellowing/mushiness I described was?