Leaf Tips Curling Down

Can anyone tell me why the leaf tips are curling down?
I haven't used much fertilizer, 2 feedings of Jack's Classic, half the recommended dosage. It's been 2 weeks since the last feeding.
I did add 1/4 tsp of Epsom salts and 3 ml of cal max.
Usually 2-3 days between waterings.

Why did you add the Epsom salts and Cal max?

What soil are you using?

Happy frog. I added epsom and cal max because there are a lot of purple stems, I think that is a sign of magnesium deficiency.

gwailo said:

Happy frog. I added epsom and cal max because there are a lot of purple stems, I think that is a sign of magnesium deficiency.

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Well it's not. Some stains just have purple stems.

Regardless of the fact that you have hardly fed her, I would give her just clean water for a while until you see new growth is perfect, and if/when entire plant gets a lighter pale green to her showing you that she is hungry then feed nutrient, and not as much as you did before. Sativa's are tricky bitches.

-edit.. Basically dont feed on some kind of schedule or guessing game, only feed her when she wants it. Use her overall shade of green from top to bottom as indicator when she is hungry, otherwise just clean water and let her process the last meal. You can always easily add more, it is not as easy to take away excess overload of mineral salts.

Is this plant over to the side under weaker light?

Johnei said:

Is this plant over to the side under weaker light?

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No, it's a 3x3 tent so the light is pretty equally distributed.

new growth stems look green. purple stems can also be from strain, cold room temperatures, or feeding with cold water.

I stopped trying to adjust my nutrient for the purple stem I was having. It means something as clones grown by a different grower didn't have it, but so far so good. Let ya know in 5 weeks lol

JohnDoeTho said:

I stopped trying to adjust my nutrient for the purple stem I was having. It means something as clones grown by a different grower didn't have it, but so far so good. Let ya know in 5 weeks lol

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i've also heard that LEDs can cause purpling stems, was the other grower was using HID lighting?

correction: purpling can be caused by UV light, which can be present in some LEDs but not in HID lighting

Hmmm very well could be! He is using 600w HPS and used like t8 flueroecent or something for veg

basically OP if you have purple stems but otherwise healthy and regular growth i wouldn't worry about it at all, could try making PH a bit more acidic so it'll uptake more P or Mg but overall if that's the only problem i wouldn't consider it a problem

^ exactly this

The medium is to wet is my guess

Its not N tox as the leaves are not dark green so I dont think you have over fed. She looks pretty healthy actually apart from the curling down.
Whats your watering schedule and have you maybe watered to often?

Over watering usually makes the whole
Leaf droop and not just the tips. Those tips do look a lot like N toxicity. Different plants have different levels of dark green. I'm not expert just my 2 cents.

JohnDoeTho said:

Over watering usually makes the whole
Leaf droop and not just the tips. Those tips do look a lot like N toxicity. Different plants have different levels of dark green. I'm not expert just my 2 cents.

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They are droopy and also curled under.

By golly taking a second look with that in the front of my mind I do have to agree, there is a complete droop of the leaf. The curl at the tip was so excessive that was what really caught my eye.

JohnDoeTho said:

By golly taking a second look with that in the front of my mind I do have to agree, there is a complete droop of the leaf. The curl at the tip was so excessive that was what really caught my eye.

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Im not saying over watering IS the problem but its a contender for sure.

Man that tip curl is so N toxic like though, possible a little bit of both?

Edit: didn't see your post above this one when I wrote hehe

Also being it looks like he has started flower relatively recently, and seems like a common time for people to run into N prob as the plant is changing its uptake rates.

Lucky Luke said:

The medium is to wet is my guess

Whats your watering schedule and have you maybe watered to often?

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2-3 days between watering. It's in a smart pot.
Do you think I should give more time between watering?
It's been 3 weeks since any fertilizer besides cal max and Epsom salts.
I appreciate all the input on this.