Mineral buildup in soil?
From Tropical Foliage Plants: A Grower's Guide p. 125-126:Leaf tip burn is a major headache for corn plant growers. It can be caused by an accumulation of boron or fluoride, high soluble salts, or moisture stress. Fluoride accumulation results in brown- or gray-colored leaf tips and margins. The necrosis progresses, frequently with a yellow halo. This problem is most common in interior situations. In commercial nurseries the most susceptible stage for tip burn is when the plants are 60 to 75% grown. At this stage the shoots may be somewhat more developed than the root systems, although still immature. Accumulation of boron results in tip burn that is more tan in color, with less of a halo.
Thanks. That's sort of what I was thinking but I expected it to look different. Fits that description perfectly though.
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