Dracaena (corn plant) leaves edge brown spots

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kenyong New York City, NY Oct 19, 2015

My corn plant has been pretty healthy for the past six months and then today suddenly I saw two brown spots on one leaf (incidentally this leaf doesn't look as healthy) and darker brown spot on two another. The three leaves are relatively new leaves. I noticed the brown spots this morning so I am not sure how long they have been there. I use tap water (soft water, has been left out for 2 days to evaporate chemicals) for years and never really notice these brown spots. In addition, I changed my soil about six months ago. Also, I never fertilize the plant.

I inspected the plant and there are no insects or mites. All other leaves are fine. These three leaves are on the same stalk. Please kindly let me know what's going on and what I should do! Thanks so much!

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Diana_K Contra Costa County, CA(Zone 9b) Oct 19, 2015

http://www.clemson.edu/extension/hgic/plants/indoor/foliage/hgic1504.html

Scroll down to Problems.

I suspect floride. I have seen the same issue on Chinese Evergreen- Aglaonema

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kenyong New York City, NY Oct 20, 2015

I tested the ph of the soil. It's 7. Would this yield some hints on if it's fluoride problem?

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Diana_K Contra Costa County, CA(Zone 9b) Oct 20, 2015

Fluoride does not alter the pH of the soil.
Is the water in NYC fluoridated?

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kenyong New York City, NY Oct 20, 2015

Thanks Diana_K. Good question. NYC water is not fluoridated. I finally found out it's frostbite.

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tapla Bay City, MI(Zone 6a) Oct 22, 2015

Unfortunately, and because the plant is known to be sensitive to fluorine, fluoride regularly gets blamed for a number of issues you might see in dracaena that more rightly belong to other issues. Primary issues causing spoiled foliage are over-watering, soil compaction, and high EC/TDS - which in essence means a high level of 'stuff' dissolved in the soil solution ..... mineral salts from tapwater and fertilizer solutions being the primaries. Don't read what I said to mean it's definitely not or couldn't be a problem related to fluorine - just that there are other issues more likely ahead of that as causal.

Why do you think it's cold injury?

Al

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