New leaf tips white and twisted

[Heavily Medicated]

I have a WOS NLXBB that is 35 days old. Planted in 3 gallon pot and promix with extra perilite. pH is 6.6 via Accurate 8. I've been feeding AN Jungle Juice 2 part base at 2 ml/L plus 2 ml/L B52, 1 ml/L CalMagic, 1 ml/L Carboload to feed the soil microbes and 2 ml/L Rhino Skin. Was having some typical CaMg issues, so upped the CalMagic to 2 ml/L this last feeding. I always adjust the pH of the feed to 6.3. I have two marshydro old style 300's in a 2'x4'x5' tent. Light is about 24" above this plant. 4" 120cfm exhaust fan and carbon filter. Two 6" fans at bottom of tent to circulate air inside tent. All the passive intake flaps wide open. Temps have fluctuated from about 83F daytime down to 65F night. Usually runs about 79-80F average.

Yesterday, I noticed that the newest leaf tips were turning white, not like a nute burn more white than brown, and the tips were twistng like a cork screw. This is prodominatly on the main top cola, and a couple of the higher up side colas. I had given only a light 1/2 ml/L base plus 2 ml/L B52, 1 ml/L CalMagic, 1 ml/L Carboload, and 2 ml/L Rhino Skin the last feeding on the 20th because I had a little nute burn from the previous feeding so backed off this time. After this feeding, this AM I started seeing this new problem, so I went back to the normal feeding described in first paragraph. The sypmtoms seem to have gotton a little worse over the course of today. This is my first grow since adding the 2nd LED and all my plants really started eating alot more CaMg. Can these symptoms be the result of having the LED's too close, about 24 inches and side by side off the top of this plant. I have never seen bleaching, so would not recognize it. Could this be what I am seeing?

Here are pics:

 

[Heavily Medicated]

I just reviewed the AN site, and I may should have not been using the Rhino Skin which is silica. It does not show using it until bloom? Any nute geru care to expound on this possibility.

 

[BR549]

While I use a different brand, I add silica from day one and haven't noticed this problem.

 

[Heavily Medicated]

While I use a different brand, I add silica from day one and haven't noticed this problem.

good to hear @BR549 I started using it this last summer to help with heat stress. I think it helped alot. Was hoping to continue using on a regular basis throughout the entire grow.

I did a little more looking around the internet and think my problem may be the light too close. As a typical male, my estimated 24 inches turned out to be about 16 after putting the measure to it. I read that the leaf corkscrew to try to protect itself from the intense light. On closer examination, the white tips are just the undersides of the leaf showing turned up. I have been finishing up a BPK alongside this one, so had that light at the 16 inches and when the NLxBB was small it was OK, now she has grown up into the harsh zone, so raising the light may fix my problem. I now have the light right over her at a true 24 inches, and slid the BPK over as far as I could and left that light at 16 but over another 6 inches.

 

[Gabro]

I know nothing, but if you asked me: the light is too close, u probably got a big badass bulb which is burning your leaves.

They seem ok, though... ive seen completelly white ones!

This doesnt remind me of nute deficiency... and you seem to know what ure doing, so its not nute burn as well...

Theres so much information and stress in this post, that im happy to grow my dope with soil and organically!

Ahahahahhaa no joke!

There was a picture here ib the forum, somewhere about bulbs and distancy (for light only, ignoring heat)

I had it saved but I had to format... so I've lost it.
But im quite sure it would solve the mistery!

Cos that graph shows when its too much light... when its optimal and when its too little.
By different wattages...

Whatever, good luck!

 

[Waira]

Hey HM :smoking:.... yup, you got the white undersides thing figured out,.. young leaves are paler all around, and the spikey hair-like cystoliths are packed close together as well, hiding color further,... good call on the lights, that's likely what happened, and 2' should be more than adequate,... watch how the leaves behave to see if they're happier... they will handle more intensity as they get older,... Otherwise, they look stellar! ...I like it when folks do the research and figure out their own solutions ....have a heap o' this!

 

[Heavily Medicated]

Hey HM :smoking:.... yup, you got the white undersides thing figured out,.. young leaves are paler all around, and the spikey hair-like cystoliths are packed close together as well, hiding color further,... good call on the lights, that's likely what happened, and 2' should be more than adequate,... watch how the leaves behave to see if they're happier... they will handle more intensity as they get older,... Otherwise, they look stellar! ...I like it when folks do the research and figure out their own solutions ....have a heap o' this!

Thanks @Waira , I should have did the research before creating this post but maybe, with the pics and commentary, maybe someone else will use this post during their research of similar problem. The plant is growing very well, and I think the temp may be playing a part in this also. I swing from 65F at night to 80 and above during light. 15F+ swing may be a little much for a young plant. Anyway, thanks everyone for helping, this does not seem to be effecting the growth so I'm letting it ride and going to be a little more careful on the plant to light distance. Pretty new to LED too, so there is more learning curve there.

 

[Heavily Medicated]

Update on this. This plant is still twisting the tips, and is a huge giant beast of a plant. I thought I had seen this before, so I went back through my journal and found that a couple years ago I had this exact same thing on a Vision Seeds Northern Lights. Again, no apparent problem on that plant either. I wonder if this has something to do with Northern Lights, as this girl is NLXBB, so maybe just the NL showing through. Just an observation.

 

[iddqd7331]

Update on this. This plant is still twisting the tips, and is a huge giant beast of a plant. I thought I had seen this before, so I went back through my journal and found that a couple years ago I had this exact same thing on a Vision Seeds Northern Lights. Again, no apparent problem on that plant either. I wonder if this has something to do with Northern Lights, as this girl is NLXBB, so maybe just the NL showing through. Just an observation.

thanks. im growing a vision seeds Northern Lights and have this issue. must be the genes

 

[bobthedog]

Update on this. This plant is still twisting the tips, and is a huge giant beast of a plant. I thought I had seen this before, so I went back through my journal and found that a couple years ago I had this exact same thing on a Vision Seeds Northern Lights. Again, no apparent problem on that plant either. I wonder if this has something to do with Northern Lights, as this girl is NLXBB, so maybe just the NL showing through. Just an observation.

Could be genetics. Do the leaves straighten out and look normal as they mature?