Heat low humidity issue ?

Does this look like a heat related - low humidity issue or something else ? I just had to bring in an electric heater so my temps are close to 80 steadily , the humidity ranges from 22%-29% . The light is a 600w mh set 2 feet above the plant . See how the leaf edges are culing upward it looks like it may be dried out a little to me , just not sure .

Raise humidity. I have same issues. Not a killer but not ideal.

Having same problem but I added a $30 humidifier and my humidity stays around 45-50% and that is with humidifier on low! I am a newbie to growing this is my first time and always thought humidity was bad but i read thats not the case until the last couple weeks of flower! Only downside to humidifier is I am pissing through distilled water!!!

Where do you measure the temps, at the canopy? Also, do you have a fan blowing directly at the plants?

An easy cheap fix is getting some old towels, soaking them and wringing them out...and hang them in your grow area.... I do this in my 3x5 tent and 2 small hand towels can raise the RH by 10% or more....

That pic is definitely heat/low humidity stress, I've been having the same issue with mine here in Socal... The leaves curl like that because there trying to sweat, its almost like you raising your arms to get air on your armpits when hot...similar for the plants...

buy a humidifier is also a solution...the combo of wet towels and humidifier has mine sitting around 30% where the air outside the tent is below 10%...

Are those spots only on the tips of the leaves? or are there spots somewhere else as well? It looks like nute burn, but you didn't mention using any nutes, so I don't know that for sure, but usually a humidity issue will make the leaves curl up and look dry or washed out, but not burnt on the tips

Little brown tips of leaves .

Humidity is perhaps the least important factor once plants are beyond clone...I am in a very arid climate, and have duel grows, one no humidity and the other I hover around 57%, and there is zero difference in the growth and overall health...although could be the strains im running.

yes the towel method works good, just be sure and spread them out....If there is a fan on them even better.

snicol said:

Humidity is perhaps the least important factor once plants are beyond clone...I am in a very arid climate, and have duel grows, one no humidity and the other I hover around 57%, and there is zero difference in the growth and overall health...although could be the strains im running.

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I think that depends on if your plant has a good root system. If the plant gets too big for its roots a low RH will dry it out

id go for a humidifier or at least the towels as suggested

the warm steam humidifiers probably work better than the cool air ones, but only if you have no issies issues with extra heat,