This is my first grow, and I was wondering if anyone could look at the close-up picture of the leaf and tell me why it has that “rusty” spotted appearance. I’m growing Jack Herer (front right), Northern Lights (rear center) and Amnesia Haze (front left). There is a bit of this happening on all 3 of the girls, but it seems to have impacted the Jack Herer more than the others.
Seeds were acquired from ILGM. I sprouted them in water, then put in Rapid Rooter plugs in a Super Sprouter under a 24w flourescent light that came with the Super Sprouter kit (tent, lights, trays, domes, heating pads). During this stage, they got “interrupted” and went into “hiding” for a few days without light. I was concerned they wouldn’t make it (too much stress), but decided to go ahead and throw them in my grow tent. I originally had 5 started, but 2 of them didn’t survive through the seedling stage due to the “unforeseen stress” they underwent.
Once I was able to take them out of hiding (LOL), I transplanted the 3 “survivors” to 5 Gal fabric pots. I do have an Active Aqua Root Spa 5-Gal (8) Bucket system, but under the circumstances (not sure if they would survive) and being my first grow, I decided last minute just to throw them in soil and see what happens. I’m using Fox Farms Ocean Forest potting soil.
Eventually I want to get to “perpetual harvest,” so I have 3 tents with different configurations/lighting (plus a drying tent), but with this grow I decided to take them all the way through the grow cycle in my primary/flowering tent.
My Primary/Flowering tent is a Plant House 5’x5’x73" with a California Light Works Solar System 1100 UVB with programmable Solar System Controller.
Based on manufacturer recommendations and lots of research, I set my controller as follows (15 min Sunrise/Sunset is ON so the lights come on and go off gradually; R= Red Spectrum, W=White Spectrum, B=Blue Spectrum):
PREVEG1: 1wk + 4days / 39R, 49W, 99B / 18hrs on
PREVEG2: 3 days / 37R, 85W, 99B / 18hrs on
VEG1: 3 wks / 50R, 99W, 99B / 18hrs on
PREFLR1: 2 days / 75R, 99W, 75B / 17hrs on
PREFLR2: 3 days / 90R, 89W, 60B / 16hrs on
PREFLR3: 2 days / 99R, 99W, 39B / 15hrs on
FLOWER1: 5 wks + 2 days / 99R, 99W, 39B / 12hrs on
FLOWER2: 3 days / 69R, 99W, 69B / 12hrs on
FLOWER3: 2 wks / 39R, 99W, 99B / 12hrs on --> +UVB
FINISH: 2 days / 39R, 99W, 99B / 6hrs on --> +UVB
They are currently in PREFLR2. I had some controller issues early on (operator error), so even though we should be at 39 days based on the lighting schedule I programmed, we’re actually at 46 days under the lights in the “big tent” right now (spent 5 extra days under VEG1).
The temp in the tent is consistently in the 72F (lights off) to 78F (lights on) range, and humidity is in the 52%-55% range (was in the mid 40s, so I added a humidifier).
Air coming directly into the tent is filtered through a Can-Fan 6" intake filter. I have also installed a CAP600-UV “whole house” Air Purifier in the “Grow Space/Room,” that houses the grow tents. This purifier produces “hospital grade” air with a Pre-Filter, Activated Carbon Filter, 99.97% efficient HEPA filter and an ozone-free, germicidal UV disinfection lamp. It recirculates the air in the grow room/space that the tents are housed in to keep the environment clean and combat odors. I also have a 6", 400CFM fan w/Charcoal Filter that pulls air from within the tent and evacuates it directly outside.
For nutrients, I am using the Fox Farm “Dirty Dozen” and have been feeding according to the chart provided by Fox Farm for growing in Soil.
I bought a RO system, so I can produce clean water, and I mix my nutrients 5 gallons at a time. Basically, I run 5 gallons of RO water in a bucket, adjust the pH to between 5.6 and 6.8 (Fox Farm’s recommendation), then add the nutrient mixture, mix well…and re-check pH and TDS.
I did screw up early on, and hit them with a massive dose of Fox Farm Big Bloom (Worm Castings & Bat Guano - 0-0.5-0.7). Basically, I screwed up my calculations on how much to add to the 5 gallons of water…and ended up using 4x more than the recommended amount. After I realized what I had done, I was concerned I would have some sort of “nutrient shock” so I did water with water only (no nutrients) for a few days.
It was shortly after this screw-up that I first noticed the rusty/yellowish spots on some leaves.
So far, I have been removing any of the leaves that develop the rusty, spotted look. For a few days after I do, they seem to thrive with new growth and look great (as far as I can tell anyway…this is my first grow ), but it inevitably comes back.
Anybody have any idea what it might be and suggestions to try to fix it? Also, any suggestions/tips based on my setup would be greatly appreciated.