Please help! I cannot identity the problem with my sick plant

[Sawyerbomb33]

I have 4 plants on day 29 of flower and woke up to one of my plants with major leaf curling. The other 3 are fine so I was ruling out heat stress. The leaves are also changing colors to a purple / brown. I can't find anything on the bet to pinpoint the problem.

Strain-crown royale
Medium-soil
Day temps 76-81
Night temps 64-68
Humidity 40-50%
Ph ballanced waterings
Bloom nutrients every other watering

 

[Chris Scorpio]

Looks pretty stressed to me

How far away is the light

 

[Sawyerbomb33]

12-18 inches varies between colas
2 LEDs combined 750w
It's only one of the 4 plants tho and the others have none if the same symptoms

 

[Chris Scorpio]

12" is too close

All plants respond different to different environment, even the same strain

18"-24" is a better distance

 

[Emilya Green]

I am thinking this looks like a fairly major magnesium deficiency. Tell me more about this balancing business... do you adjust your pH after adding your bloom nutes to the water? If so, what do you adjust to? Your problem likely could be just a pH problem, but lets figure out what is going on before we start recommending adding something.

 

[Sawyerbomb33]

Yes always balance after adding nutes and always check runoff ph as well.
This plants runoff range has always been between 6.3-6.5

 

[Emilya Green]

runoff pH means exactly nothing in a soil grow.. it is not even worth the time mentioning it. The important number is what pH you are adjusting to, each time you add a fluid to that soil. What is that number please?

 

[BeanTownFan420]

My guess is lamp burn.

 

[Sawyerbomb33]

Average of last 8 waterings Is 6.6

 

[BeanTownFan420]

If its only on leaves directly under bulb its lamp burn.

 

[Emilya Green]

average? Well, that is a bit high... can you get it down to 6.3-6.5? That very well could be the cause of your problem.

 

[Sawyerbomb33]

That would be no problem. It's a bit high because I was trying to adjust to the lower runoff ph. Didn't realise runoff ph in soon was useless.

 

[BeanTownFan420]

Leaves uneffected are farther from light its lamp burn.

 

[Sawyerbomb33]

The curling is on the top third of the plant. Other 3 plants are at the same distance and no symptoms at all

 

[George Mc]

The curling is on the top third of the plant. Other 3 plants are at the same distance and no symptoms at all

Here's an idea, there are two great suggestions above. Raise your light and check your pH going into the soil. Your problem is either one or both. Have a good night

 

[Sawyerbomb33]

Thank you all for the replies !! Much appreciated.

 

[BeanTownFan420]

Wuff.

 

[BeanTownFan420]

Welcome to the wonderful world of i hope i didnt screw this up again.

 

[Sawyerbomb33]

Yes sir ! Everything was moving along great till this

 

[BeanTownFan420]

Your buds will still get you sky hi bruh dont sweat it.