-Problem: Young leaves show yellowing and begin to develop speckled rust spots before beginning to cup upward, turn yellow/brown, become extremely brittle and die. Some older and middle aged leaves also affected my yellowing. Original symptoms appear most like a calcium or magnesium deficiency, thought some of the spots look like mite damage (though there are no mites on the plants).
-Medium/grow method: ProMix HP
-Feed and supplements used: Greenleaf Mega Crop, watered to around 800-1000ppm, previously pH was around 5.8-5.9, now ~6.2. I water from a watering can about every three days (based on weight of pots).
-Water source: Tap water that sits out over night to dechlorinate. pH is usually around 7.2 and ppm is ~150z
-Strain and age: Mephisto Forum Stomper, day 75
-Climate: High: 81F 66% RH Low: 72F 43% RH
- Light used: 240w LED QBs on a 18/6 cycle, around 24” from the tops.
-Additional info: About a month ago, I noticed what appeared to be a slight magnesium or calcium deficiency and so began supplementing with Cal-Mag, however it just got worse. I read up more and realized that I might have been watering with too low pH water for my medium (~5.8-5.9) and causing a lockout, so I then flushed with mild nutrient water (~600ppm) pHed to 6.3. Runoff began with a very high ppm and low pH, but was in normal range by the end of the flush. However, my problem only continued to get worse, and I figured that I might have a toxic salt buildup. So, about 5 days later, I flushed again with 3x the water at ~350ppm and 6.3 pH, but my problem only seems to continue getting worse. For the most recent water I returned to normal water (~900ppm and 6.2 pH), but haven’t noticed any improvements. Any ideas to help my girls make it to harvest without too much more damage? They only need to hold out for another couple of weeks! Also, I’m not sure if this is relevant, but this is my first time doing more extreme LST, and as a result the plants are a bit behind schedule.
Original pictures of the problems when they first began:
Current pictures:
-Medium/grow method: ProMix HP
-Feed and supplements used: Greenleaf Mega Crop, watered to around 800-1000ppm, previously pH was around 5.8-5.9, now ~6.2. I water from a watering can about every three days (based on weight of pots).
-Water source: Tap water that sits out over night to dechlorinate. pH is usually around 7.2 and ppm is ~150z
-Strain and age: Mephisto Forum Stomper, day 75
-Climate: High: 81F 66% RH Low: 72F 43% RH
- Light used: 240w LED QBs on a 18/6 cycle, around 24” from the tops.
-Additional info: About a month ago, I noticed what appeared to be a slight magnesium or calcium deficiency and so began supplementing with Cal-Mag, however it just got worse. I read up more and realized that I might have been watering with too low pH water for my medium (~5.8-5.9) and causing a lockout, so I then flushed with mild nutrient water (~600ppm) pHed to 6.3. Runoff began with a very high ppm and low pH, but was in normal range by the end of the flush. However, my problem only continued to get worse, and I figured that I might have a toxic salt buildup. So, about 5 days later, I flushed again with 3x the water at ~350ppm and 6.3 pH, but my problem only seems to continue getting worse. For the most recent water I returned to normal water (~900ppm and 6.2 pH), but haven’t noticed any improvements. Any ideas to help my girls make it to harvest without too much more damage? They only need to hold out for another couple of weeks! Also, I’m not sure if this is relevant, but this is my first time doing more extreme LST, and as a result the plants are a bit behind schedule.
Original pictures of the problems when they first began:
Current pictures:
