"Tubed" leaves, more info inside

Ok, so small grow in a constructed box, about 3x7x5. 400w HPS, in soil. the strain is "orange cough" which I'm going to presume is a cross between strawberry cough and orange kush (?).I have fed with compost tea for weeks, and recently started a FoxFarm routine in lieu of the tea.

I've attached a photo regarding one plant that has some fan leaves that are curling under from the sides, creating a tube or straw shape. It happened mainly around the top, but some smaller leaves below have it too. You can also see some browning in the pics, I'm not too concerned with this (think its nutrient lock from a low pH).

I'm wondering if the leaf shape can also be attributed to a nutrient lock or pH related?



I think the problem began when I tried a top dressing of some good farm compost. Within a day of applying, I began to see problems. I've removed the compost, and when I test runoff pH with a GH kit, it reads crazy low (4-5, hard to tell with the liquid kit, as it gets muddied by soil and the nutes). I fed yesterday with the FoxFarm and added a bit of baking soda to get the solution pH to around 6.5-7. I'll post more in a few days after seeing if the pH adjustment helps, but what do you all think?

Thanks in advance for any help.

What are your temperatures just out of curiosity? The leaf curling could possibly be moisture stress.

See how the blades of the leaves are curling under like a claw? That means to much N. The brown burnt tips is nute burn. The pH as you said could have caused all of this. I would lay off the food for a hot minute and just use some good ol 6.5 pH water.

bakeddude said:

What are your temperatures just out of curiosity? The leaf curling could possibly be moisture stress.

See how the blades of the leaves are curling under like a claw? That means to much N. The brown burnt tips is nute burn. The pH as you said could have caused all of this. I would lay off the food for a hot minute and just use some good ol 6.5 pH water.

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My exaust fan was ordered today, so temps fluctuate a bit. But in general, between 68-78. I did once catch a temp reading a hi/low of 89/71, after that I ran some A/C ducting in from a vent to get some cooling going on.

I'll try just water for a week and see what happens.

Yeah those temps arent bad enough to cause those leaves to curl like that. Humidity might be playin a role whats that at?

Good idea with the water, just get em flushed out so they are drinking clean pH'd water.

Humidity has been at or near 55% consistently.

I'll be watering with pH balanced h2o for a week, and I'll try and remember to come back & post an update.

Thanks for the help, everyone!

Yeah man your humidity is good. You might need to water with 3 times the amount of water as the size of your container and then water with some flowering nutes at low low strength and feel it out.

You can tell that is 100% heat stress. You can say the temps are 79 but I know for a fact that it's a little hotter. Plants get like that in the 88-89 range.

whatever the problem is, it's gnarly, hope you get it sorted out before you harvest.
as mentioned, improper ph surely led to the nute burn, looks bad too lol. come to think of it, that compost you used could have very well been contaminated.
as well, you should have mentioned that this is not the only plant with the problem if that is true, I can see the nute burn and curling of the plants in the background.

leetsoup said:

whatever the problem is, it's gnarly, hope you get it sorted out before you harvest.
as mentioned, improper ph surely led to the nute burn, looks bad too lol. come to think of it, that compost you used could have very well been contaminated.
as well, you should have mentioned that this is not the only plant with the problem if that is true, I can see the nute burn and curling of the plants in the background.

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Me too!

the compost worked well outside on veggies, I think it was a matter of how drastically it changed pH and available nutrients more than any contamination, but who knows...you may be right.

I didn't mention my other girl because only the plant in front exibits the clawing/rolling of the leaves. The plant in the back has had a problem here and there, but is doing pretty well all things considered. It doesn't show nearly the reaction that the plant in the photo did.

Updates:

• Temps have been 67-76. Cool, if anything.
• Humidity still near or at 50%
• Flushed with 7.0 h2o (tap at 6ish, I used baking soda to up it a bit.) 3 Gallons per pot, yesterday morning.

No major changes after two days. Metabolism seems to have slowed a bit, pots are still heavy with water. I suppose that could just be attributed to the saturation of the soil, though. I plan on evaluating drainage tomorrow, as well. An good rules of thumb for how quick a container should drain?

The plant I was most worried about seems to be getting floppy...almost like it's losing turgidity, but only in the main stem. It's not wilted, but I notice it flopping a little bit in the breeze. It looks like shit, overall. Hope I see some recovery before harvest

The other girl is doing pretty fine, relatively. Gonna ride this one out....

Going to keep watering with plain ol h2o, will update in a few days.

Mine did the exact same thing, I lost 14 ladies to it, did u spray yours with anything? I used endall to kill mites and the next day they all rolled up like that. I thought it was nutrient lockout so I flushed and the water that came out was like yellow, after a week the pots were still soaked and the plants were all bone dry. I also sprayed them with a low nute foiler and that didn't help. I have no idea what caused it.

Heterotextual said:

Mine did the exact same thing, I lost 14 ladies to it, did u spray yours with anything? I used endall to kill mites and the next day they all rolled up like that. I thought it was nutrient lockout so I flushed and the water that came out was like yellow, after a week the pots were still soaked and the plants were all bone dry. I also sprayed them with a low nute foiler and that didn't help. I have no idea what caused it.

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I have sprayed in the past with a kelp foliar spray. Haven't used it in weeks. When I flushed, I also sprayed down the leaves and buds with good ol h2o.

I thought it was mg def so I sprayed it with epson salt water, your leaves are just going to get dry and die, I also thought it was moisture and heat problem so I added a few buckets full of water to the room to raise humidity. When I decided to harvest the buds were sooo dry that I was crushing buds with my hands. I decided to throw them all out, the roots were under developed cuz when I grabbed the stalk the whole plant came out of the soil, so for my next grow I'm just going to use plain water every 3rd feeding. I think it could be nutrient overdose

no good, should lower the PH, 5.5 to 6.5