What's stressing my plant? Heat or not enough water? Too much light?

[Strongstyleking]

Gotta get my heat situation dealt with... New baby at home so cranking up the heat. High temp in the tent is 85 low 67 humidity steady in the high 50s. Not so hot but obviously its having an effect. Other plants seem not as affected. I'm rocking the spiderfarmer sf4000 which comes it at about 530 watts iirc. Lights are 55" from the seedlings so shouldn't have issues. At any rate I've been using the light for tomato starts and greens with no issues so not sure what's up. Growing medium is 4:1 promix to a lightly amended coots mix living soil based on peat worm castings, pumice and rice hulls, and basalt rock dust. Cheers guys

 

[Creeperpark]

Lighting

Lighting

Hay you look just like me and that's ok because I won't be here much longer. The LED lights are not very good for starting seeds. I grew my plants in solo's under ole fluorescent lights and when my plants got 3 or 4 leaf nodes I would put them under the LEDs. These were about 3 weeks old in photo. Also I used Pro Mix BX by itself with super results.

 

[Strongstyleking]

Only alternative is t12s with grow bulbs. In the past everything grown under there grows really slow and comes out leggy and weak. I am noticing leaf warping so not sure which is worse.

 

[troutman]

Sometimes transplanting helps and seed packs can give you one plant that never grows like the others
and is defective no matter what you do. If the others are doing fine don't beat yourself over it.

 

[Strongstyleking]

Starting to notice more leaf curl in the other plants. Moved them under the t12s for the time being to see if things improve. I was starting to think I was under watering but not sure. Here's a pic of the plants this morning. At this point lights have only been on an hour.

 

[troutman]

Could be over or underwatering. Humidity may be too low especially when the temp goes to 80+. I say transplant them.

 

[Strongstyleking]

Humidity usually around 60 in the tent, 35 in the room. I watered alot yesterday and they all looking droopy so could be the water...

 

[Strongstyleking]

I could transplant but they haven't showed sex yet... also running low on promix and castings...

 

[heatherlonglee]

Don't amend the Pro-Mix, it's already set perfect for clones and seedlings. The size pictured I would be watering at about 250 ppm even less if possible like 200 ppm. If you must amend; wait until plants are larger and you go into your final largest pot, then mix in the amendments. I wouldn't transplant until they're larger so next time no amendments.

What I would do is this. Decrease lights ON cycle by at least one hour. Water low ppm less than 200, if you have to use just tap water and already at the ppm limit then thats fine just use tap. Don't use pure RO water. If you have RO water; add fertilizer of choice to 200ppm. Wait 3 days (full 72hrs) between waterings at the size you are now. In about 10 days you'll be fine.

 

[Esme]

I would say over watering mate they look good tho mate.

I put my seeds right under a 600 Watt HPS

 

[Strongstyleking]

Yeah itd definitely overwatered. The poster who mentioned the light cycle was on to something I think. I've been doing 20hrs on 4 off for the first little bit and just went to 18/6 a day or 2 ago. As far as nutes go, my home mix is very lighty amended so don't think that's it. I've used it to grow tomato plants, beans, squash, and cukes to good effect. I definitely have been overwatering but I also might have too much thermex (yucca) in my watering solution. Yucca is just a wedding agent but it has some sugar like molasses iirc. I'll update when I see a change in the plants. The other ones look better but the one I was worried about is still droopy. It's the heaviest cup from water so there you go.

 

[Strongstyleking]

The saga continues...

Plants almost died on me. I bottom water by moving the plants into tray filled with water for a few minutes to water evenly but got occupied dealing with the baby. I thought that was the problem but noticed my plants weren't getting better and growth had stunted and with yellowing and necrosis setting in. *Pics provided below*

A few days ago I saw what looked like leaf mold on the leaves of 5 out of 8 plants (day 35) I took them out and wrestled with whether to cull or not. I decided to put them in quarantine by the window and research proper diagnosis and options.

I noticed by the end of the day that the plants looked greener and the leaves started to lift up again. The other plants in the tent are looking close to death on the other hand.

Temps in the tent are high at 81-84f near "canopy" but nothing outlandish. Humidity was low at around 40f during the day for the first few weeks but I've got them steady at 62%. I had issues with pretty big drops in temp and spikes of humidity at night hitting respective lows and highs of 60f and 90%, a perfect breeding ground for mold...

My environmental issues have improved since installing exhaust fans and dialing in my humidifier which is less needed as temperature rises outside.

All this points to light being my issue. I threw insect netting to lower the light intensity on the plant in the tent and noticed some greening and lift in the leaves so going to go ahead and dim the LEDs though not sure by how much.

Following the logic that light is the issue, could the spotting be sign of deficiency and not mold? I provided pics below. Could neem treatment work? Would it be wise to apply to plants this weak and at this stage of development? Would waiting make things worse? Tempted to snip them but besides the time invested I got little money for new beans so if I get one girl saved out of this that would be preferred.

Cheers

 

[Strongstyleking]

The least bad one...

 

[GMT]

Pumping new borns with steroids in the hope they'll grow like Arnold S (not gonna try his last name).
Too much too young man. Let em chill while small, no big lights, no nutes unless hydro coco etc. Let them develop a strong root system, then start making them work.
Small light, clones in just compost, add tap water. That's it, the rest is just gonna hurt them.

 

[Strongstyleking]

Not using bottled nutes. Just promix a couple handfuls of worm castings and a bit of kelp.

 

[Strongstyleking]

That's for 8 gallon sized pot bags so don't think my mix is too rich. Could be I suppose.

 

[MindEater]

I decided to put them in quarantine by the window and research proper diagnosis and options.

Hmm seems like it's your light source, if by window you mean sunlight. Everyone under Leds is having the same problems. My seedlings were showing deficiencies,namely phosphorous, in fertile soil under led before inert mediums under cmh. I mean God damn something is fuckered if I've got spots a week after germ and i did under Leds

 

[Strongstyleking]

Yeah its been really throwing me off! So those spots don't look like disease? I mean they are only on the oldest leaves and new ones seem unaffected. Any thoughts on foliar treatments at this stage? Thinking about neem or sufoil x.

 

[Esme]

Yeah its been really throwing me off! So those spots don't look like disease? I mean they are only on the oldest leaves and new ones seem unaffected. Any thoughts on foliar treatments at this stage? Thinking about neem or sufoil x.

You've gone from small pots into a 30L(8gallon) pot? with no re-potting. I go from a 500ML pot to a 20L pot in coco and very hard to over water.

TO be honest mate I would scrap the plants and start again. Maybe in a Semi-Hydro medium coco?

I think your over watering the plants mate, I know in coco you will need to run CalMag with LED light's, but if you take a look at google and look at over watering plants in soil they look a lot like yours.

With a medium like coco it's really hard to over water yeah you have to buy EC(PPM) Pen and a PH tool and you can run Organics in coco tho I've never done this.

 

[therevverend]

Too rich soil/over watering. You're probably not watering too often, it's that the rich soil holds in the water, doesn't drain away like a lighter mix would. I'd re-pot them, use a mix with less nutrients, then feed them teas when you need to feed them. Instead of starting with the nutes already in the soil.

The spots look like necrosis from nutrient burn, that's a disease but not caused by bugs or fungus or whatever. I've seen this happen so many times.

Last summer I ran out of my usual mix, picked up a few bags from the local nursery. Way too heavy, too much worm castings and other goodies in it. At that point my plants weren't small, at least weren't as young as yours, 1-2 footers. They took it hard, a couple of the more sensitive ones died. The bitch is that you can't flush the soil because it holds water, doesn't release it.

We call it 'nutrient burn' but it's almost like you're smothering the plant. In a lighter soil it could probably handle the nutrients. I feel like they can't resperate oxygen from the soil. It's weird sometimes, I've seen plants do fine in the same soil that causes other plants to do this shit. When I pop them out of their pots they'll have barely any roots in the new soil or they'll be root bound. Every time putting them in new dirt snaps them out of it.