My plants fell over and died

A question from a fellow grower:

My plants sprouted and after about 5 days the all fell over and died. I chauked it up to overwatering. Using rockwool and soaked to correct ph 5.5-6. Soaked seeds in water for about 24 hrs til tap root showed and put the in 1.5" cube. Heat mat , 10" dome and t5 light. 18/6 They stretched and removed dome and put about 2-3" over.

Strain (type, bag seed):
My first try was GDP and GG#4. all dropped and died at @ two inches. Order 295513
The pictures I sent are 5 LSD and 5 Critical mass from my 2nd order. Started in cup of water on 6/7 and put in rockwool and dome on 6/8 Order 298727. One CM and two LSD didn’t even sprout. They have just been randomly dropping and drying. As of this am, I only have 3 of 10 seeds standing strong and all 10 from 1st try died. Of 20 seeds, only these 3 are standing
I still have 5 Gold leaf, 5 Jack Herer auto, and 5 chocolope that I haven’t started. Need advice on which strain of those 3 I should try again with.

Soil in pots, hydroponic, or coco?:
I am using 1.5" Rockwool cubes there is no plastic wrapped around these. Soaked in 5.5 ph water before putting in seeds.

PH of runoff or solution in reservoir?:
I have not got to this point yet, they keep dying.

What is strength of nutrient mix? EC, or TDS:
Right now I am using a 25% mix. But they are dropping and dying @ the 6-7 day time frame, so I haven’t used nutes alot except for an attempt to keep them alive.

Indoor or outdoor:

Light system, size?:
Germ in water til I see tap root. Put in cubes and in a tall dome with a t-5 light across top. I have a 315w CMH growers choice unit also. Which have both been on 24 hrs prior to sprouting. The 315 w has been height and watt adjusted to acclimate seedings growth.
After they sprout, switched to a two inch dome and same light set up. Temp has reached 90* max but try to level at 75* range. I have a humidifier but is small, humidity has dropped to 34%, but try to keep in 55% range.

Temps day, night:
Max 93* min 68* avg 75* adjust according if temp is low or high.

Humidity day, night
Max 60% min 34% avg @45% adjust as needed.

Ventilation system (yes/no, size):
Yes, 2 - hurricane 6 inch. 1 blowing in 5x5 tent and other is exhaust going out
1 10" oscillating fan.

AC, humidifier, de-humidifier?:
Only AC is the intake blower air and a small humidifier hold @ a gallon of water, last about a day. I feel that the airflow is sucking humidity out through exhaust

Co2 (yes/no):

I need advice here, I am losing my butt in seeds.

I think one issue may be the nutrients. A good rule of thumb is not to introduce nutrients until the little round leaves, the first little ones to appear, arw yellowing and or falling off. Those will usually have enough stored energy for the plant for the forst week or 2. [quote=“ILGM.Support.Nicole, post:1, topic:20241”]
What is strength of nutrient mix? EC, or TDS:
Right now I am using a 25% mix.

What height is it set at. Some of the seedling in the picture look a little stretchy to me and I was just wondering what height it was at. That may be another issure.

I’m not familiar with rockwool so I would wait to see if anyone else can comment and shed more light to help you get squared away.

@Countryboyjvd1971 @MattyBear @Donaldj @Hogmaster here are a few that can help

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Thanks for the tag @Dieselgrower. Few things jump out to me. First… no nutrients this early. You should only be spraying ph’d water a couple times a day until they have at least a few sets of true leaves. Second is the humidity is a little low. Keep the humidity as close to 70% RH as you can and keep the dome on them for 7-10 days, lifting it off to allow fresh air a few times a day.


At the time of pics it was at 40" and the CMH light was switched to 190w.

I was just answering the form @ the % of nutrients I was using. I had not used nutes in this batch. The reference was towards my first batch of 10 that died off @ 10 days.
Here are the other pics from that morning. 3 Of 10 didn’t sprout and the rest are at various stages of chaos.

Thanks for your concern.