Why are my plants dieing?

I agree more and better pictures would help, especially in this area. If it's what it looks like I'm going all in on damping off. Dark weak stems are another hallmark. Over watering and damping off go hand in hand.

Duhh said:

Damping off in full grown plants? I thought that was only for seedlings. I'll check that.

Nothing I can do about the heat atm, I've had high temps before though it never did this.

Click to expand...

How does it manifest in older plants, what's it look like? I couldn't find any info on that.

Duhh said:

How does it manifest in older plants, what's it look like? I couldn't find any info on that.

Click to expand...

Reference my above picture and photo. I'll see if I can find you some pics.

sandman83 said:

any pictures of the larger/when they were healthier for comparison?

Click to expand...

I'll take some of the healthy ones I don't have any of the dieing ones previous to being this way.

Killaki said:

Reference my above picture and photo. I'll see if I can find you some pics.

Click to expand...

I see what u mean but the stems don't seem weak at all, I've seen damping off alot in seedlings, I'll check later. I pulled the 2 dead ones out ages ago and the stems weren't deseased like a damping off infection, it's the leaves and new growth that wilts, stems are rigid, but I will look

Duhh said:

I see what u mean but the stems don't seem weak at all, I've seen damping off alot in seedlings, I'll check later. I pulled the 2 dead ones out ages ago and the stems weren't deseased like a damping off infection, it's the leaves and new growth that wilts, stems are rigid, but I will look

Click to expand...

I tried finding a good pic in a thread here to try and avoid outside links but since it wasn't as easy as I hoped and I'm lazy here's a picture from my Google search. If you look into common diseases your knowledge will be richer for it. I've had flowering plants catch something and die before. It sucks, especially if you don't catch it right away and it spreads to everything.

Killaki said:

I tried finding a good pic in a thread here to try and avoid outside links but since it wasn't as easy as I hoped and I'm lazy here's a picture from my Google search. If you look into common diseases your knowledge will be richer for it. I've had flowering plants catch something and die before. It sucks, especially if you don't catch it right away and it spreads to everything.

Click to expand...

Ah thanks. Yes I see the damping off looks the same on a grown plant as a seedling, but the stems on my plants that have died are healthy and hard.

They were healthy white before, they aren't slimey though, but yeah something going on there, that plant is a goner, was so nice.

So I could change the res but what if I used some additive also? I hear physan 20 is good but I can't get that where I am. What if I turned the res temp way down that should kill all the nasties yes? I put a bit of calcium hypochlorite in last night as haven't had time to drain and change the res, 80 liters. The water did smell a tiny bit funky, I definitely think I was watering too much, as the roots in the sitting in the bit of water between waterings and in lights out have created rot I think, that's the smell, very slight tho.

Man they going down one at a time, but the roots aren't too bad, they a bit off colour but they don't smell hardly at all, just a bit right up close, the roots are still firm there's no slime, but for sure the plants are checking out. How much h202 is too much? Like if I mixed up a strong mix and soaked all the roots in them for a a bit does anyone know if that would help? Then dump a boatload into the res and run that trough a few times? I don't know man never had to deal with the before so I'm just guessing really. I haven't changed the res yet because if they're going to die anyway what's the pint of all that work, plus then that new res will be infected too and I'll have to do it all again. I have put about 4grams of 32% calcium hypochlorite in last night, lowered the watering to 4 times over 12 hours for 10 minutes each time, and it only take 5 minutes to drain not 12, the roots aren't sealed in just covered from light so the water does evaporate more so i feel like 4 times is good, I didn't water at all during ligjts out, and I've lowered the res temp to 14 degrees celcius. Would be good if I could save some of them there's still healthy ones there.

A week later. Their growth is a bit slowed for sure and I'm not expecting a huge yeild but they aren't dieing and these were in the same water and flood tables as the ones that died.

Duhh said:

A week later. Their growth is a bit slowed for sure and I'm not expecting a huge yeild but they aren't dieing and these were in the same water and flood tables as the ones that died.

Click to expand...

Picture #2, take a close look is that powder mildew? Either way clean all the dead leaves out of there that you can get. Nice on keeping them alive. I hope you have a good finish.

Duhh said:

Hello I'm. Doing flood and drain and I have all healthy plants in week 4 and just the past 2 weeks 1 wilted and died then about 6 days ago another one did the exact same thing, now today another one has done it and a 4th is showing signs of doing it, the pistils go from white to brown when it happens. All were super healthy, the plants around them are fine. The water is being.chilled to 19 degrees celcius, air temp is a bit warm it's hot here, 30 degrees celcius but there's a fan moving lots of air and sucking lots out too, ambient temps are hot, they get flooded once an hour for 15 minutes, the ec is between 1.8 and 2.0 ph is between5.8 and 6.3 it drifts everyday, the grow medium is clay pebbles, the water isn't slimey or anything. I have missed a few lights off watering but there is always a it of feed left in the bottom of the flood trays. Man I really don't want them all the go down one at a time I don't know why this is happening.

Click to expand...

EC seems WAY too high and watering WAY too much. I grow in rockwool but recently coached a new grower friend through his first flood and drain with clay pebbles. We kept his EC around .9 and I had him watering 3 or 4 times a day at most. Everything went smooth. Thats really all I can offer.

curious2garden said:

Picture #2, take a close look is that powder mildew? Either way clean all the dead leaves out of there that you can get. Nice on keeping them alive. I hope you have a good finish.

Click to expand...

Thanks bro. No there's no powdery mildew, might be a dried leaf, even the dried leaves are bone dry crispy I've got the mositure down so low. The finish will be diminished of course but yeah not a total loss and I learned something.

pegboy said:

EC seems WAY too high and watering WAY too much. I grow in rockwool but recently coached a new grower friend through his first flood and drain with clay pebbles. We kept his EC around .9 and I had him watering 3 or 4 times a day at most. Everything went smooth. Thats really all I can offer.

Click to expand...

Hey thanks but ec isn't too high, 1.8 and 2.0 is a good level for that time in flowering, I think 0.9 is super low actually. Yes I was totally watering too much though for sure, and the ambient temps here during lights off for like 3 weeks made the water get up to 22/23 degrees celcius, I knew that because I'd turn my chiller off at lights out and when I'd switch it back on that was the temp, and I'd flood those trays that recirculating water, and I had allowed the plants to sit in some water left in the flood trays because I thought the plants would soak it up but because I was watering too much they didn't need more they need much much less, so now I know that created the perfect Conditions for root rot for sure. so yeah I totally asked for this, first time doing it but I see how it happened now. Flood trays are dry now after watering, only 4 waterings with lights on, none within lights off, chiller stays on all the time keeping a low water temp.

If it was me I would use a biological defense/aid Vs trying to be sterile…

Drench and spray southern ag garden friendly biological fungicide aka 500x in concentration of hydroguard , same species and way for ur buck. Hell that’s why u don’t see it as foliar option.
SABF DRENCH 1-3 ML PER 10gal , foliar 5ml (preventive, 15ml = infection/high pressure/risk mode). Shoot I use this even for my spray on my domes for clones to any clone dip. results show just like budrot/pm reduction %




cheap on Amazon and once I started using this from clone to outdoor prevention and every drench = my plants def ended out better but also less chances of issues occurring.


also for a SAR/immunity boost I woild also suggest in growing cannabis it’s worth it to apply regalia , not only did I see healthier plants but the mold/issues def decreased ! Worth every penny and Ive been using it for 5 years now and def one of my main investments I’m willing to cement in .

https://marronebio.com/products/regalia/