watered - got leaf curl - top new growth looks right

[steve1966]

Hello. along my first grow journey here I ran into this issue.
This is Dark Soul #1 seedling. Parts look great, others not so much.
After a watering, to water in 2-8-4 bloom boost (Gaia Green), the next day the lower leaves curled.
Seems I overwatered? BUT, the new top growth sugar leaves look great. Does that make sense?
Is that normal? I thought if one overwatered that all the leaves would get droopy and curl.

pH to 6.5 on water with pH down.
68% rh and about 72 degrees f, so the VPD is in a decent range.
Just switched over to 12/12 lights a day ago.
Coco grow. 4-4-4 and now 2-8-4 added. 5 gallon pots, amendments 3 tbsp per gal.
soil pH unknown.

thanks for the help. I am just trying to understand my kids better.
anything else that might help figure this out, let me know.

Steve

 

[mancorn]

Looks like a heat issue. Was there a heater or exhaust blowing on the plant? (Take pictures with your lights out as the purple lights make it difficult for anyone to see what’s going on.)

 

[steve1966]

Looks like a heat issue. Was there a heater or exhaust blowing on the plant? (Take pictures with your lights out as the purple lights make it difficult for anyone to see what’s going on.)

no heater. have fans blowing, not directly on plants. Just strikes me odd that this occurred after watering. Other than that curl, the top new growth looks good, to me.

 

[mancorn]

Certainly looks like a heat scorch. Perhaps the leaf was touching the sides of the tent (that was hot from the light). You can get a leave burn from overwatering as the leaves burst and then become crunchy. Where your lights on full tilt while watering?

 

[Captspaulding]

Wind burn
Too much n
You only need enough air movement to get your plants just barely dance in a little bit. They don’t need to be whipping around at all. This can happen with indirect air as well. It just depends on how hopped up you have it set
I also agree with @mancorn
Do your space have heated floors?
Also
You didn’t happen to just switch to LED set up did you??

 

[steve1966]

Certainly looks like a heat scorch. Perhaps the leaf was touching the sides of the tent (that was hot from the light). You can get a leave burn from overwatering as the leaves burst and then become crunchy. Where your lights on full tilt while watering?

I'm using "cheapo" 40 watt rated strip gro light leds that I can't dim. They have a full spectrum or more red led setting . I have them set at about 24 inches and haven't been getting any burn. I mean, obviously I am going to observe them and let the pots dry and see what happens. Possibly the fans are blowing across them too much in the tent. As long as I am getting great new growth, I guess all the more I can do is wait and observe and make posts if anything changes or gets worse. My main concern is that the problem started at the bottom and will migrate up the tiers of leaves. I don't think the leaves touched the tent, the fans circulate air and may be putting too much breeze over the plants. The plants aren't bouncing around, just a little bit of a shimmy from the fans.

 

[steve1966]

Wind burn
Too much n
You only need enough air movement to get your plants just barely dance in a little bit. They don’t need to be whipping around at all. This can happen with indirect air as well. It just depends on how hopped up you have it set
I also agree with @mancorn
Do your space have heated floors?
Also
You didn’t happen to just switch to LED set up did you??

Thanks for the response and advice.
Wind burn could make sense. I have just started this first grow in September and quite possibly don't have my fans set quite right.
I am waiting on backorder spider farmer oscillating fans, so right now they are non oscillating but not pointed directly at the plants.
LED from start. cheapo gro lights with full or red/blue spectrums rated 40 watts at 24 inches.
no heated floors.
Wind burn is making more sense, I just got thrown for a loop when this happened a day after watering. Especially because the kids are looking so good. Like a typical overbearing dad here, I got concerned when something new to me developed :)

I think nitrogen is good. I transplanted the seedlings at a month old to 5 gallon pots with 4-4-4 gaia green at 3 tbsp per gallon.
The next feeding was a day ago (2 plus months along) with very little 4-4-4 and some 2-8-4 surface sprinkled and scratched in and watered in. Then after the watering, I got these leaf curls on the bottom foliage.
Jumped into the organic grow.
Not using bottled synthetic nutes, only the gaia green slow release stuff, with the exception of a small amount of Biobizz cal-mag as a supplement.
I watched a lot of mr. canuck and other growers before jumping in. Education is huge with growing cannabis.
But, as we all know, the information doesn't mean as much until you pop the seeds and watch the grow happen :)
That's when I really started learning!
I managed to get them two and a half months along :)
I'm grateful for the helpful and knowledgeable folks here, for sure.

 

[HeadHunterpipes]

Common reasons why marijuana leaves curl up include1234:

• Nutrient deficiency (incorrect pH, nutrients went bad, etc.)
• Light stress (light too close)
• Heat stress (too hot)
• Watering or root problem
• Cold shock