I think this is called canoeing. New growth is OK but quickly folds in. Cal-mag seemed to help for a minute but then after a few days no joy. One sibling has milder case, one is vibrant.
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That may be heat stress, tacoing the plant exposes less surface to keep humidity … 
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Could be caused by too much heat / low humidity or both combined. I’ve also seen canoe happen from too much light but since the whole plant looks affected could be heat depending on how hot it is where you are.
The pot in the pic also looks insanely dry. I wouldn’t let it get to that point personally. The plants transpire water through the leaves and it helps cool them down. If the stomata are closed/ if the pot is too dry they might have a hard time cooling down. The leaf surface temp in that situation might be higher than the outside temp when it’s usually a few degrees f lower.
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Thanks George. It’s outdoors and this started during a mild March. It’s been in partial shade for the last two weeks.
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Been watering regularly. Doesn’t seem to make much difference. Pot was not light but just added some water and Fish meal.
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Ease off on your nutes a little…
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That type of leaf tip curling is the classic sign of mites. Probably not spider mites since there are no webs. My vote is hemp russet mites. Need a USB microscope to the little bastards, they are smaller than cystolith hairs.
Have learned to recognize this one all too well.
Remedies are anything from Athena IPM spray to pyrethrin spray to beneficial insects. They are very persistent. I cleared an infected tent in about 6 weeks with twice a day IPM spray for 3 weeks then once a day for 3 weeks, mixed at 100 mils/gal.
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Jeez, ya ain’t gotta scare him! 
I’d have to agree with @George and @neogitus.
I think she’s hot.
I will add:
Is that concrete that your pots are sitting on?
If so, remember that the root temp will contribute to the overall health of the plant.
Her pot could also be hot.
Best of luck friend.
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I have battled russet mites before 
. The issue is isolated to one (maybe two) sibling plants. I know what russet mites look like and will break out my microscope ASAP.
At least that one is easy to ID.
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Checked a top and bottom leaf under the microscope. Found a single aphid but no sign of Russet Mites.
Mixed up a batch of Neem and Pro-Tekt and sprayed down the whole grow preventatively. I’ll give a week and hit them again with Spinosad.
The sick plant, an Everyday Haze, has not shown sex yet. Current plan is to keep it around and watch for bugs when the trichomes come up.
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That’s great news, at least no russet mites. I may have a bit of ptsd-ish from battling those little turds. Every time a side top curls it’s like “OH FFFFFFFFFFF THEY ARE BACK” lol
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For future reference: spinosad treatment today. Plant is looking improved. Old curl remains but new growth has been better since Neem 10 days ago.
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