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.

Outdoor DWC feminized White Widow in Nor Cal-side by side comparison

I think she’s Beautiful


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