Any ideas what the problem is?

[Sismagic]

5 gallon cloth pots
Coco
White widow auto
Week 5
Canna a and b half strength
6.1 ph
15hrs light
2 600w leds
25 percent run off when I water
I’m getting good growth but the tips of the leaves are turning yellow does anyone have any idea what the problem might be

 

[MrSauga]

Hi there and welcome to

It appears you have some nute burn. Back off the nutes. You're at half strength, so go to quarter strength.

 

[MrSauga]

Might want to float that pH a bit from 5.8-6.1 for your coco. Treat it like a hydro grow.

 

[Sismagic]

Might want to float that pH a bit from 5.8-6.1 for your coco. Treat it like a hydro grow.

Would you flush them

 

[MrSauga]

Would you flush them

No, not at all. The tips wil never recover but the problem should stop going lower and stop progressing on the top. As the plant gets older you can bump up the feed again. Nice looking plants btw!

 

[MrSauga]

If you want you can run straight pH'd water next feed and go back to regular feeding next time at 1/4 strength. Personally I would keep feeding as per the schedule but at a lower dose.

 

[Sismagic]

If you want you can run straight pH'd water next feed and go back to regular feeding next time at 1/4 strength. Personally I would keep feeding as per the schedule but at a lower dose.

I will give it a try without flushing and let you know in about a week or so how it goes.thanks for the advice much appreciated .

 

[Slicknick909]

How close is your light? Usually the tips starting to yellow is a symptom of "light burn"

 

[Stunned]

Classic signs of nute burn.
It's not all bad
A little nute burn won't do any real damage
And it means you're pushing your plants
Just dial it back a little bit

 

[BeanTownFan420]

Classic signs of nute burn.
It's not all bad
A little nute burn won't do any real damage
And it means you're pushing your plants
Just dial it back a little bit

Exactly what i would have said.

 

[shottafire]

How often are you watering? 5 gallon is much too big in my opinion. 2 gallons is plenty for coco. Important to treat coco as a hydro medium and not a soil medium. And never flush a plant in coco mid grow ever. Just feed more often and if you have absolutely have to reduce your nutrients.
I’m not an auto guy but half strength canna a and b Shouldn’t burn your plants.