Good afternoon, Growmies!
I tried to search this, but couldn’t come up with just one thing it could be. It seems like it could be several things, so I’m hoping for a little help from you guys.
This is GDP in week 5 of flower. This was an extra seed that popped and I didn’t want to kill her, so I just let it grow out in a 1 gallon pot. It’s in Coco w/Perlite. I’m feeding Jacks 321 at about 1000 ppm. Ph between 5.8 and 6.2, tap water. Temp in the tent is 75-78 awake and about 72 sleeping. Humidity always 51-53%. Good airflow on top and below canopy.
ACI 400 watt light. I had it on 10 about 20" above the canopy because i have one, giant bud sticking up too high, but I just turned it down to 8. My app said dli was around 33.
I just fed, PPM/PH in was 988/6.13, Runoff was 2519/5.4.
Not sure but maybe this will help:
@Fishy might want to check ph and runoff ppms, I see calcium deficiency along with possibly potassium on leaf tips and edges. You may have salt buildup which will drop ph and cause lockout. Coco will retain a lot of nutes if your not getting plenty of runoff each water/feeding. You could flush with plain 6.0 water until ppms drop and ph is in range, then immediately feed them bloom nutes at half strength, no more. I know a lot of growers say not to check runoff, but I catch most issues with ec, ph, before they show on leaves. Most deficiencies take a few weeks to show up on leaves and by then you have to play catch up. I’d rather catch it before it becomes an issue. Good luck!
@Growdoc Thanks so much for the reply! I’m going to do that tonight. I just want to make sure I have this right. Flush well with plain water PH’d to 6. Then, give it regular water PH’d 5.8-6.2 with 1/2 dose of Calmag, right?
Welcome from my experience of growing Granddaddy purple they do like calmag .
@Fishy cal mag at reg rate, then bloom mutes at 1/4 or 1/2 strength.