Nice room, did you just build a 2x4 frame and staple the plastic up? Thatâ??s what I plan to do when I have the space.

I know heat stress well, itâ??s a old friend of mine. Iâ??ve caused it in probably every way.
I attached two pictures.
One is classic radiant heat stress. IE the light is too close causing only the top of the plant to be too hot, thus it only affects the top of the plant.

The other (the clones) are from fluctuation heat stress. (I made these names up)
They had a large degree in fluctuation which exceeded the acceptable range for growth.

We had to cover them with a blanket at night to block the light, as they lived in our bedroom (on 24/0 photoperiod); so they heated up too much at night. And they were near a window so they got too cold in the day. They are fine now and growing well, heat stress IMO isnâ??t a big deal. Once you fix it you plants grow fine.

Nowâ?¦
Notice the different looks of the plants. The radiant heat stress cased the leafs to grow funny. The blades arenâ??t flat they have ridges because the areas between the veins have swollen up leaving the veins imbedded (creating ridges)

While the clones have developed twisted growth with flat leafs. It is kinda hard to spot in this pic, look at the two plants in the middle row. Notice the lower two fan leafs on the closestâ?¦

I didnâ??t see any good pics of the grow tips of your plants in your photo bucket.
harris7 Reviewed by harris7 on . Twisted baldes? OK the plant in question is a 3 day old Northern. I grow in sunshine mix 4(soil w/ perlite) and use chemicle nutes, the pH is at about 6.5. I use a 400w MH bulb. The temp is a steady 79-80, and humidity is 28-35%. Today I flushed, transplanted then fed with 1/2 concentrated 10-10-10. Then a few hours later once they had a chance to absorbe the water I LST'ed a little to expose some branchs. Now it is only one blade on one leaf that is twisting. I don't know what it could be from...blushing...it Rating: 5