Reaching out for help please! This is my second try growing cannabis. The first time didn’t go so well and now I’m seeing similar issues.
What strain, ILGM Kush Mix, one each Hindu, Master, Bubba Kush
Method: Soil - Ocean Forest Vessels: 3 gallon plastic pot PH of Water, aged tap water is 7.5 and that's what they got the first 4 weeks, since then I've been adjusting Ph to 6.5. Indoor Light system- Spiderfarmer 2000 at 15 inches above leaf tops Temps; Day 75, Night 68 Humidity; Day 45, Night 65 Ventilation system; Yes, 4 inch straight pipe with charcoal filter Humidifier yes, without humidifier it gets down into the mid 30's Co2; no Nutrients; Foxfarm- Grow Big, Great White- Premium Mycorrhizae
Seeds started great. Seedlings were short and stout and dark green. First 5-6 weeks of veg everything looked amazing. Then I started seeing yellowing and then brown spots. I took the Master Kush plant and removed leaves from the bottom areas and gave extra GrowBig, (I had been giving half recommended dose). Not seeing improvement, actually got worse. Got a Ph meter and corrected 7.5 tap water to 6.5 after letting it sit for 3 days. Now at week 8 and not seeing the dark green I want. Plus more yellowing and brown spots. Plants are growing with 8 or 9 tops each that should flower but new growth is light green and 2 nodes down things look bad. Have seen female pistils on each plant so they seem rowdy but I don’t want to cut lights to flower when leaves look like this plus there’s still plenty of room to grow in the tent and I haven’t introduced a scrog net yet.
So I hoped correcting the water Ph would correct a nutrient lockout if that’s what it was but I haven’t seen improvement so now I’m thinking it must be something else. Over watering? I’m giving them just enough to see some flow out of the bottom and about 3 days apart. Before I water I heft the pot and they feel light after 3 days. Grow Big has a lot of nutrients in it so I thought I had that covered but maybe not. Some of the bigger older fan leaves lower down seem a darker green like when they first sprouted 3 weeks ago so perhaps that’s a clue. I’d say it seems like yellowing is more pronounced at the top of the plant. The yellowing starts between the veins of the leaves. That might be Manganese deficiency, Potassium excess? I’m not sure. The brown spots look the most like Manganese deficiency on the online picture charts but Grow big should be supplying that. Does anyone see the answer?
These yellowing issues seem very similar to my first grow so that has me thinking what has changed and what is the same. I have new, different seeds. New, different soil. New, different nutrients. I have the same tent, same light, same pots, still using tap water aged uncovered at least 3 days but now I’m adjusting Ph to 6.5. I’m not sure which way to turn yet.