First of all Thanks to You all for making growing possible for people without any previous knowledge, like me. I have been growing for 4 years now and so far I was able to sort out all the problems myself, till now…
I run four table perpetual ebb&flow in clay pebbles, harvest every 2 weeks. I use Canna Aqua nutrients along with H2O2. Strain - Critical Jack.
It all started about 2 months ago when I already have had two healthy and quite impressive harvests with this strain. At the time I introduced bottled CO2, which I ran ( still do ) at 1000-1200 ppm. Temperatures in flower room were increased from 26C to 30C, also more (100-200 ppm ) nutrients were added. For a couple of weeks everything went smoothly except res and root zone temps went up to 23-24C which I dealt with by insulating the reservoirs. Then this started to happen
Picture nr.1 table 2, week 3
2. table 3, week 5
3, 4, 5 table 4, week 7
At first I was sure it is a light burn / heat stress situation, so I lifted up the lights and brought the temps down to 26 again. RH is about 60% and air flow in the room is good, so it’s unlikely that this is an environmental issue.
It is not ph problem either, 5.7-5.8, ph meter calibrated and recalibrated.
It is not root problem as far as I can tell, roots look and smell very good.
I don’t think it could be nutrient burn, it went up to 1300ppm in table 2 for a while, but I brought it down to under 1000ppm as soon as I realized that lifting up lights doesn’t help.
It couldn’t be bad CO2 or something, cause it’s all good in veg room with the same ppm’s.
I clean and sterilize my clay pebbles before use with H2O2, maybe not enough?
It’s all very confusing, I’m trying everything I can think of, it doesn’t make any sense anymore…
This is fourth harvest I am about to lose and I’m running out of ideas, only two left;
- about the same time I started to run CO2 I opened a new can of Canna Aqua Flores.Bought it from Max grow shop in Poland. It doesn’t seem likely but has anybody heard of fake Canna nutrients?
- could it be some kind of infection or disease? I can not find anything that matches these symptoms.
It’s a terrible, terrible feeling to watch those plants suffering and not being able to help for months. Any ideas guys?