A question from a fellow grower:
What causes yellow and brown spots on cannabis leaves? Started about 8 weeks into vegetation.
I checked your symptom checker about 10 days ago and it looked like I had a calcium deficiency. I added garden lime to the water for a couple days, but it didn’t seem to solve the problem. See attached.
Strain (type, bag seed): White Widow from seed.
Soil in pots, hydroponic, or coco?: SunGro Horticulture SUGRMIX4
PH of runoff or solution in reservoir?: 6.5
What is strength of nutrient mix? EC, or TDS: N/A
Indoor or outdoor: Indoor
Light system, size?: Advanced Platinum Series P300 300w 12-band LED Grow Light - DUAL VEG/FLOWER FULL SPECTRUM
Temps day, night: 75-80 / 60-70
Humidity day, night 50 / 50
Ventilation system (yes/no, size): Yes, 6"
AC, humidifier, de-humidifier?: Humidifier
Co2 (yes/no): No