I purchased a very tall (8 ft) and healthy corn plant a few months ago and have been doing my best to provide it with the right growing conditions. It's in a bright room but never receives direct sunlight, the temperature is kept between 55-75, and I water it regularly, but let it dry out before rewatering. Unfortunately, I believe I may have also been too attentive, in that I decided to fertilize and repot as well. The reason I decided to repot was that after fertilization, roots started growing straight up out of the pot, so I assumed it was root bound and needed more space. Anyway, now I have many mottled leaves with various yellow, brown, or semi-transparent spots (sort of like a frosted window where that part of the leaf is thinner than the rest) and I'm worried that the situation is getting worse, as it's appearing on new growth. Does anyone have any recommendations as to how I can save my Dracaena?

Your plant is a Dracaena, but not a Corn Plant. Please post a photo that shows the entire plant and its pot.

WillC said:Your plant is a Dracaena, but not a Corn Plant. Please post a photo that shows the entire plant and its pot.

Thanks for the clarification, I wasn't certain, just guessing based on other pictures I've seen. Here is a picture of the whole plant

The leaf symptoms are probably result of the repotting and also possibly the fertilizing. During repotting roots often get damaged especially if some or most of the original soil is removed. There's no cure for that except time and proper watering although the leaf discoloration is permanent.

I suggest that you remove all of the loose soil that you added to the top the original rootball, then allow the top inch of remaining soil to get dry watering thoroughly. If your tap water is on the hard side then use filtered or distilled and stop fertilizing altogether.

Ok thank you for the assistance!

I have a general question regarding Dracaena:

This one I have it for several year now. It has some spots on the leaves (some bigger and some really small ones), and as I'm working from home office now, I've seen that here's a time during the day, when it gets direct sunlight. These spots can be becasue of this or something else can cause the problem? Is it possible to cure it or only to stop of growing these spots?

@muzmo - Those leaf spots were probably caused by some excessive soil dryness that occurred when those leave were first emerging. Those spots are permanent, but they can be trimmed off to improve the plant's appearance.

It is better if you can move it away from the window just a bit so that the sun's rays do not all on it directly at any time during the day.

I see it is in a small pot and that is fine. But it will probably need a thorough watering as soon as the surface of the soil feels dry to the touch. If your tap water is hard, use filtered or distilled.