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For the last month or so, many leaves on my Dracaena Massangeana, including some newer ones, have been yellowing at an alarming rate. A lot of them have died completely.

The first time I noticed this was in September while I was away for a few weeks. The plant received water from an automatic watering system dispensing water for a minute every day. I think it didn’t receive more than 3 L of water over the course of a month (concentrated around the drip tube), which is why I initially thought this was due to underwatering.

I usually water the plant every 5 days with 0.5 to 0.7 L of tap water. I let the water sit for about 12 hours before using it as I read some of the chemicals that evaporate aren’t great for the plant.

Barring subtle differences, I don’t think anything changed in the way I water the plant between before my period away from home and after my return. When I returned and saw the issue I gave the plant some extra water thinking underwatering may be the cause.

The plant has had a history of brown spots on the leaves, but they were fairly localized. I was told it might have to do with fungus. I repotted the plant into a larger vase and trimmed all of the leaves with spots when this happened.

The yellowing I’m experiencing now covers the whole leaf, so it’s eirher an exacerbated version of the same issue, or a different issue altogether.

I’m wondering what’s causing the yellowing on this plant. At this point I suspect I may be overwatering the plant, but it’s very hard to tell what might be going on.

I have never fertilized this plant, so I’m not sure if that’s a problem too. I have no idea what fertilizer is good for this plant, nor whether it is a good idea to fertilize it now. Any suggestions would help tremendously.

Some pictures of the plant and the issue:

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Thanks for your help!

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