Kratky problems!

I searched hard and long for an answer, so I’ll try to get to the point. I started doing Kratky stuff on pepper growing forums, but don’t find a lot of support on the cannabis ones. I get the concerns about the lack of oxygenation, so I’m thinking of switching to a DWC or Hempy pot set up instead. In the meantime, I recently transferred the most amazing feminized White Widow seedling when it quickly outgrew it’s Aerogarden pod. The stems (not leaves) are arching (not dropping) down, and I’m wondering what that might mean.

Hoping I can add some pictures to show how much bigger this seedling is than it’s germination mates that started in soil (first picture) , and how this plant looks two days after putting it outside (last picture) I’ll also add the problem ticket.

Strain; Type, Bag seed, or NA White Widdow,fem but not auto

Soil in pots, Hydroponic, or Coco? Hydroponic

System type? Kratky (no airstone)

PH of runoff or solution in reservoir? Solution in resevoir pH about 6.5 when I started.

What is strength of nutrient mix? EC, or TDS Not sure, but I did check it. General Hydroponics MaxiGro about 2T in 4 gallon.

Indoor or Outdoor Outdoor for last three days

Light system, size? Sun!

Temps; Day, Night 90’s during day, 64 at nught

Humidity; Day, Night usually pretty dry, but a bit less so last few days.

Ventilation system; Yes, No, Size
AC, Humidifier, De-humidifier, none

Co2; Yes, No no

Here’s how it looks tonight, a little over three weeks old.


They are not floppy. They are almost stiffly coiled downward. Doesn’t seem like a bug or disease thing, but maybe nutrient or environmental. I know it’s too hot, but that can’t be helped. Didn’t expect much from these first five seeds, but this one has me hooked.

I think she’s Beautiful

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your plants are drowning the larger your plants get the more oxygen they need in their res I grow in hydro so this is not alien topic for me the aero garden (air garden :wink: ) was doing fine because they had oxygen in nutrient solution if you are not using pump or stones to add air to water you are quite literally drowning your plants


WOW thanks for the quick response!.

So the bent stems mean drowned roots? I’m used to seeing wilted, ye!low leaves with overwatered plants. Never grew mj before but many years with sub irrigation planters.

I’m also curious about how it differed from a Hempy pot. Is it the exchange of the portion of water everyday that adds air? Might it help if I change the water until my pump arrives?

Also, the whole air roots vs water roots thing is a no go? I have a pepper plantin a kratky aet up that does okay (but not great).

Last question; I was not expecting much from these test seeds, figuring the season is wrong, and I’m heading out of town, but this one seedling frew like CRAZY in my aerogarden. 10 inches tall and wide, and 18 inches of pearly white roots in three weeks. Is that unusual?

leafs droop if over watering and the stage and speed of growth effect how fast a plant uses DO dissolved oxygen in water as well as temp of water. Adding water adds fresh o2 try adding peroxide at 5-10ml L I am betting your leafs will perk right up in a day confirming the low o2. Peroxide is h2o2 the free o2 will raise DO much like adding fresh water your lady is still fairly small so it can take couple days to use o2 as it gets larger the o2 drops faster.


Updated pictures. Moved the original to DWC, moved one from aerogarden to a Hempy bucket, and another to DWC. One of the five original seedlings has been in dirt throughout, and one never sprouted. The differences are stunning. The six week potting soil seedling is on the left, the aerogarden seedling on the right. They are both 6 weeks old. I’m sure I didn’t do right by the potting soil seedling.

About to travel for two weeks, so they will be on their own ( the Hempy on drip with miracle grow slow release…yes, I know. Not good.) . It was a cool experiment. I’ll try again in the spring.


Hempy bucket pic tomorrow.

“Air roots” when I moved from kratky to DWC

Back after 12 day vacay with an update.

Hope to post a new thread soon. In the meantime,

Check my leaf problems

and trichomes!

About three weeks in flower, dwc, outside in N. Cal


Started seeds in the aerogarden again three weeks ago, this time three White Widow, three Gold Leaf a week later. One Gold Leaf never made it past two leaves, while all three White Widows took off. I moved two White widow Outside to dwc today, and a few hours later, both severly wilted, some leaves to a crisp. Perhaps the water level was too low, perhaps too much sun too fast, perhaps two much damage separating roots. Perhaps more things. Recovered somewhat with higher water, in the shade.

In the process of separating the roots in the aerogarden, one Gold Leaf separated from it’s roots. I suppose that could mean mechanical trauma, root not, or something else. Was thinking of treating it like a clone , but I think it’s a goner.



This looks like the “leaf problem” from last year.

Wind Burn

From an indoor grow, but it can be pretty windy outdoors here. I wonder what is the pathogenesis here.

It says “not being able to fulfill all its normal processes.”.

That plant in the 12 days ago was one of two that went out in a dwc bucket, in full sun, at about three weeks old. They recovered somewhat, but the White Widow that went out a week or so later looks amazing (to me)! And I learned something.

BTW, the first two seedlings did that rigid stem arcing thing when I transferred the outside again, and this time with decent aeration with astronger pump.

“Week later” out front in the first picture, and is the first one on the far left in the second. The other two look sort of “stretchy”, and a paler green. Hard to believe they are each about five weeks old. I think that might be a nutrient deficiency. I’m using MaxiGro and ppm is about 600. ph about 6.5.

Im no expert but ive been told that ph in hydro or soiless should be around 5.8 if im not mistaken you ph might be to high as well but id ask a few of the pros


@Josh1126 is right. Optimum ph for hydro is 5.8

Thank you, and I’ve been working on bringing it down. I’ve read 5.8 for veg, but a bit higher for flowering; is that right? I’m also battling a bit if root rot, and winder if that increases the pH. I just started adding hydroguard.

I use hydrogaurd ALWAYS. I don’t think that is correct about the ph. Ask @Donaldj. He KNOWS about ph and nutrients

actually 5.8-6 for veg 5.8-5.6 flower nutrient avail changes in each range lower ph lowers N level raises P slightly reduces Cal and K higher ph increases N Cal K while reducing P (P) is needed most during bud development K during rooting Cal stretch and top growth N for leaf development


This year’s grow, and wonder i

f this might be pre-flowering.