Northernlights x Blueberry

[Stardawg37]

hey folks hope everyone is well was looking for a bit of advice we’ve got 6 plants on the go there currently 6 weeks into flowering just started adding pk 13/14 today my friend grew the same strain and they flowered for 9 weeks 1 of the plants is starting to get yellow leafs they feel dry to touch I just wondered if it was because they were coming to the end of there cycle or maybe something to do with nutrients thanks for all the help

 

[Old Salt]

Pistils and trichomes are used to judge harvest time. I'm not seeing any amber pistils yet, so it would seem you have more than two weeks to go. It's a little early to be cannibalizing themselves for the final push.

The leaves at the top seem to have bleached or burned tips. If this is so, your light is too close to the canopy, or you have a slight case of nutrient burn. The leaves look thin, cupped and clawed, as well as the lower leaves yellowing. I'd say the narrow leaves could be normal, if the plant is a sativa, or leans that way. The cupping and clawing are most likely environmental. Heat stress seems likely.

What is the temperature and humidity in your grow area?

 

[Stardawg37]

Thanks for the reply the lights are 2 foot away from the top of the plants there 600 hps the temp is between 25-26 degrees never any higher never lower humidity is never any higher than 45 and never any lower than 40 thanks for your help

 

[Old Salt]

If you are growing in soil, give Emily a shout. She's a busy lady experienced with soil, so I haven't done it for you. Just put an '@' in front of her name, and the system will send her an alert.

 

[Skunkyfunkygreenshit]

@Emilya

 

[Emilya Green]

Hiya @Skunkyfunkygreenshit and welcome to the forum!
I see a potassium deficiency and that it was a good call to start adding the PK supplement... you just should have started adding it a couple of watering cycles ago. No harm.. just keep it coming in now and this problem will stop spreading. I love long running sativas... good luck with the rest of it. My advice is to plan on a 3x flush in about a week and then for that last two weeks feed heavily definitely including the pk booster. Pay no attention to those who would tell you to give nothing but water at the end... or you will end with what you see here, x10.

 

[Stardawg37]

Thanks so much for taking the time out to reply brilliant info and old salt putting us in touch we’l do exactly as you said and start flushing them in a week then we’l start with the nutrients heavy thanks again

 

[Skunkyfunkygreenshit]

Thanks so much for taking the time out to reply brilliant info and old salt putting us in touch we’l do exactly as you said and start flushing them in a week then we’l start with the nutrients heavy thanks again

Thank you both @Salt & @Emilya

 

[Skunkyfunkygreenshit]

@Emilya we have these girls in coco soil so is it still 3 flushes ? Thank you

@Stardawg37

 

[Emilya Green]

@Emilya we have these girls in coco soil so is it still 3 flushes ? Thank you

@Stardawg37

I am not a coco knowledgeable person at all, but I think I have heard that it doesn't take as much to properly flush coco as it does in soil

 

[Old Salt]

@Emilya we have these girls in coco soil so is it still 3 flushes ? Thank you

@Stardawg37

Unlike soil, coco has no nutrients for your plants. If you water with your nutrient solution to between 10% and 20% run off every time, there's no need to flush. The purpose of flushing in a soil grow is to wash away the excess nutrients and salts that build up in the root zone. The run off every time you water in a coco grow does the same thing, so there's very rarely a need for a flush only watering.

The only time I had problems of nutrient and salt build up was when I didn't water to run off several times in a row. I corrected this by using a nutrient solution of the regular strength to 50% run off.

 

[Skunkyfunkygreenshit]

Unlike soil, coco has no nutrients for your plants. If you water with your nutrient solution to between 10% and 20% run off every time, there's no need to flush. The purpose of flushing in a soil grow is to wash away the excess nutrients and salts that build up in the root zone. The run off every time you water in a coco grow does the same thing, so there's very rarely a need for a flush only watering.

The only time I had problems of nutrient and salt build up was when I didn't water to run off several times in a row. I corrected this by using a nutrient solution of the regular strength to 50% run off.

 

[Old Salt]

The leaves seem to be excessively dark green. It could be the light, but I'm thinking too much nitrogen. Let's wait and see what Emilya has to say.