First ever grow - 1st lower leaves dying?

Big 'Hi' to all.

Having messed my guts up with alcohol and bad eating, time to try something new. Excited to be trying to grow my own CBD/THC 1:1 and a bit worried that it may be heading tits up!

Two and a half weeks since planting germinated seed in 12 litre fabric pot, the 1st pair of proper leaves (same height as Cotyledons) appear to be dying - have been for days. After plenty of web trawling I can't seem to see this being normal or even mentioned. The rest of the plant looks ok I think. It's a big pot for a seedling but I didn't want to plant and replant and several websites said ok to plant direct into final pot. Could I be over or under watering? I've been very careful to follow the instructions of the many websites that tend to only have slight variations in procedures.

On a 18/6 LED light cycle in v. small grow tent 2 foot x 2 foot: I've been keeping RH at about 60%, temp at around 25C(77F), lights out night time 13C(55F) to 15C(59F), venting 5 mins every 30 mins just to turnover the air supply until it gets bigger and smellier and needs the extra CO2.

Hopefully the info and picture helps enough for some feedback. No doubt I'm doing something stupid.
Thanks for reading!
Max

 

Yeah, I’m sure you’re right. Next time I’ll do that. I’ve just bought myself a moisture meter too because I read so much about over watering. In such a big pot with a seedling it’s hard to know how much water is near the roots and how much just drains to the bottom.
Medium is BioGreen Totall Mix.
Thanks for feedback, Mick.

 

Hi CrazyGardener, soil mix is BioGreen Totall Mix and I’m not currently feeding it anything. The bag said there were plenty of nutrients in the substrate for a few weeks at least. Also I read that seedlings don’t need much at such an early stage. I have a whole load of various fertiliser liquids that came with a starter pack I bought so I was going to start using them in the vegetative phase which I figured would be next week - ish?
Thanks for your help.

 

Hi Vee, thanks for your feedback. I’m a bit confused. No nutes whatsoever have been added to the soil mix. Surely the soil alone can’t be giving the plant nutrient burn. I’d really hate to restart. I’ve kinda grown attached to my ‘baby’.

 

Ran upstairs and did exactly what you suggested. Water ph on own was 6.7. After adding soil mix and shaking ph went down to 6.6. I see from the table that ph should be 5.8 to 6.0 but damn it’s not that way out enough to burn - right? Rest of plant above looks good - to me, which might not mean much - so could it be something that’s now rectified itself. Thanks again for the help, Vee.

 

Thanks for your thoughts sosogrow. Wasn’t that a slurry test I did as per Vee’s suggestion? I think overwatering might be the answer based on your amazing pics. I’ll cut it right back and see what happens. Thanks again.

 

Ill look at perlite for my next grow to be sure. Light is: 1 x Photon LED Board 120w. I keep it 8 - 10 inches above plant. I will let the water dry out for a while and see what happens. Fingers crossed. I’ll post another picture if there’s any change. Thanks for the help.

 

Thanks @sosogrow. That's not good news. It's only a 2 foot by 2 foot tent mind. If she dies then I'll buy another before restarting and if she lives I'll look a bit sooner. Any that you recommend? Regarding the leaves today, it looks like there is slight yellowing around the edges which I've read could mean malnutrition but then also could mean other things. I've added some new photos with the led light off this time to hopefully get a better perspective of colour. I'll try anything to save her so all ideas welcome.