Just posting this up because I had a real eureka moment this week. My seedlings grow in the laundry room, which is normally fairly humid to begin with, so I don't have to humidify. As the temps dropped recently and the heat came on more often, I decided to use a supplemental humidifier.

My tap water is fairly chlorinated, so I always let it sit a long time before I use it for watering or nute mixtures. The pH is naturally right around 6.5, so that's not a concern.

About a week or so in with the humid, I began to notice a few of them begin to yellow on the larger leaves. I tried flushing, increasing nutes, decreasing nutes, everything, the problem worsened. A few days ago, I walked in there and noticed how much chlorine smell there was. A quick check of the symptoms of chlorosis confirmed my suspicions.

I was filling my humidifier tanks with straight tap water, and it's been messing with the leaves. Also was causing premature yellowing in the bloom room as well, since I have the same humid in there. The yellow leaves are a lost cause, but the new growth looks green and healthy.

Just passing this along, in case anyone else is having a yellowing leaf mystery. Grow on!
Rumpl4skn Reviewed by Rumpl4skn on . Yellowing chlorosis from humidifier?! Just posting this up because I had a real eureka moment this week. My seedlings grow in the laundry room, which is normally fairly humid to begin with, so I don't have to humidify. As the temps dropped recently and the heat came on more often, I decided to use a supplemental humidifier. My tap water is fairly chlorinated, so I always let it sit a long time before I use it for watering or nute mixtures. The pH is naturally right around 6.5, so that's not a concern. About a week or so in Rating: 5