Gardening-Nightblooming Cereus problem orangey leaves

Question

I have had this Nightblooming Cereus for 12 years, and it took 8 years before blooming and has always been healthy. I just noticed over the last month that some leaves are turning an orange color with some brown spots. Is this something to be worried about? The leaves feel healthy. There’s nothing on them. See the photo, and you can enlarge to see the orangey color.

• 

Answer 1

I am not sure what the problem is, and the plant looks generally healthy, but excessive light or nutrient deficiencies are two possibilities. It might have a slight sunburn, or it might need to be fed with a balanced fertilizer if you aren't doing so already.