Only one clone with leaves curling up

Hey guys,

Bit of a strange one here:

I have 6 clones, four of which are from the same mother (all are about 5-6 weeks old). However, one of the four has been having major leaf curling problems in the upward direction (see picture - problem clone on right). This is strange considering it is right next to clones that are genetically identical which have no such problem.

My thoughts are either heat stress, humidity problem, or over feeding. The thing is, my temps range between 60 and 80 (usually right at 70) and my humidity ranges between 40 and 60% (usually right at 50%). I have 3 fans gently blowing the air around my grow tent. I use foxfarm ocean forest soil and pH my tap water (125 ppm) to 6.5. And I only fed this clone a very light feeding (1/4 strength) of veg nutes (FF grow big) 3 weeks ago. Also, overfeeding tends to cause leaves to curl downward, not upward like my clone.

What could the issue be if this plant is right next to genetically identical clones in the exact same environment that aren't having the same problem?

Thanks for any help!

I can provide complete grow details if needed.

-Jnon

Some sort of issue here.. looks like heat stress or something tied to VP

How much water are you giving it? It looks over watered to me. If not it could be a deficiency.

I can guess all day on what it might be but if it were my plant I would PH my water closer to 6.0 and give it a light dose of kelp and magnesium and see if it improves.

If not it could just be a bad cutting since the others are doing well.

Thanks for the replies guys.

I water approximately half a gallon per 3 gallon pot every 3 days (just enough until I see runoff). This particular clone was transplanted a bit early (little plant in a big pot), so that could be the problem, but I don't get the sense it is over-watered.

Leaf roll is common with high vapor pressure deficit and low relative humidity, but my RH is usually around between 40 and 60% ... in fact, I just checked and it is 57%... so I can't imagine the RH is too low.

I will try the kelp and magnesium. Not sure why I should pH closer to 6.0. FFOF is buffered between 6.3 and 6.8, so I figure pHing my water to 6.5 should work well.

Happy growing everyone.

jnonymous said:

Thanks for the replies guys.

I water approximately half a gallon per 3 gallon pot every 3 days (just enough until I see runoff). This particular clone was transplanted a bit early (little plant in a big pot), so that could be the problem, but I don't get the sense it is over-watered.

Leaf roll is common with high vapor pressure deficit and low relative humidity, but my RH is usually around between 40 and 60% ... in fact, I just checked and it is 57%... so I can't imagine the RH is too low.

I will try the kelp and magnesium. Not sure why I should pH closer to 6.0. FFOF is buffered between 6.3 and 6.8, so I figure pHing my water to 6.5 should work well.

Happy growing everyone.

Click to expand...

I'm seeing a lot of people PH at 6.5, and according to the charts that's where you want to be at. I aim for 6.2 or 6.3 in soil and 5.7 or 5.8 in hydro. It works well for me but it's just an anecdotal personal preference.