Week 6 flower - leaf tops curling up??

[Oblivi0us]

Hi my plant is overall healthy but recently noticed the lead tips are curling up. Is this from nutrient burn? Or start of a lockout/deficiency?

Growing in coco. Using h3ads method 6/9 micro/bloom with ro water. Ec 1.6, ppm 700-800. Watering daily till 20% runoff. In a 4x4 tent with 315cmh about 2 ft above canopy. Day time temps 72f, night time 65f. Humidity 35-45%. Have air flowing in bottom and exhaust taking air out the top.

My guess is it’s nutrient burn and getting worse? 1 feed ago I stopped with the micro and just doing 10ml bloom since I’m nearing week 7 of flower. And adding 2.5ml GH cal-mag. To get .4 ec and 400ppm. So I’m hoping the lower ec will help them come back to normal.

I am also confused because I read a lot of forum posts saying don’t worry about run off ec in coco that it doesn’t matter... but then have read from a few articles other places saying the run off ec does matter if it’s significantly higher than the water going in and to try to keep what’s coming out 200 points within range of the inflow .( https://www.cocoforcannabis.com/managerunoffec/ ) Which my runoff ec was 3.3 and ppm 1671 which indicates salt build up if that’s the case.

Any help would be appreciated thank you

 

[Creeperpark]

Your plants are not bad at all and look pretty good. Its always good to check everything that goes in and everything thing that comes out of container. Sounds like you got a handle on it and found the best solution.

 

[Douglas.Curtis]

How much runoff are you giving them? (Ok, I see 20% now) The longer you feed the more excess gets washed out, so it's important to wash at least some of it out each time. Are you saturating evenly? Getting nute solution through all the coco each time?

Very nice looking.

 

[AgentPothead]

For week 7 I would have expected a lot more yellowing of the fan leaves? They might just be "too full" of nutrients. Tacoing leaves can also be a sign of heat stress, but it sounds like you have that under control. If the tacoing is worse at the top of the plant it's more likely heat stress, but if it's in an area where airflow is focused, it might be too low of humidity issue. Whatever if it, those plants do look good and I wouldn't tear my hair out over it.

 

[Douglas.Curtis]

For week 7 I would have expected a lot more yellowing of the fan leaves? They might just be "too full" of nutrients.

Good catch, I completely missed the listed timing in flower.

What's the generally expected harvest time on this/these strains?

 

[AgentPothead]

Good catch, I completely missed the listed timing in flower.

What's the generally expected harvest time on this/these strains?

I mean maybe it's a 12 week strain and they are just getting started, right

 

[Cmoon]

add water, sit back relax watch the sun go down and good herb prevail.


bests cmoon