Seedlings going yellow but is it heat stress ?

[WinnyBoyBlue]

Hey yall !!

I have 3 seedlings, 1 was started a few weeks before the 2 smaller ones, which are about a week old or so. They are under 1x mars hydro 300W LED about 30cm away. The heat around the plant is roughly 26-28 degrees C with running air circulating the tent.

It looks kind of like heat stress, but its on most of the leaves ? this is as cool as my tent can possibly get here in Aus.

Cheers in advance

 

[SouthCross]

What's the humidity level? The temperature isn't that all that high. Past 85°f up in the 90's, is the bad zone.

 

[WinnyBoyBlue]

40-55ish % RH

 

[SouthCross]

That's perfect humidity. Looking at the soil next. Cannabis doesn't like wood chip potting soil. Especially if it has bark. It'll struggle verses a sphagum peat moss base potting soil.

 

[*BUDS]

What is that rubbish they are trying to grow out of? Never use poor quality soil when growing cannabis.
The medium is the cause of your issues. Try this next time you can get it from the hydro shop, very simple and great results.

 

[WinnyBoyBlue]

What is that rubbish they are trying to grow out of? Never use poor quality soil when growing cannabis.
The medium is the cause of your issues. Try this next time you can get it from the hydro shop, very simple and great results.

Im feel dumb, I just went to bunnnings and got a neutral soil...didn't think it would matter aha....should have done my research. Will definately look out for that next time !! thankyou

 

[WinnyBoyBlue]

What is that rubbish they are trying to grow out of? Never use poor quality soil when growing cannabis.
The medium is the cause of your issues. Try this next time you can get it from the hydro shop, very simple and great results.

Is there a way I can save the main plant, or the smaller ones at all ?

 

[WinnyBoyBlue]

That's perfect humidity. Looking at the soil next. Cannabis doesn't like wood chip potting soil. Especially if it has bark. It'll struggle verses a sphagum peat moss base potting soil.

I got me alot of woodchip xD hit the nail on the head, cheers ! would something like Yates Superthrive help it at this stage ?

 

[*BUDS]

Bunnings soil is crap for growing dope.
You can save them by using veg hydro nutes like terra vega, starting asap at half strength.

 

[*BUDS]

I got me alot of woodchip xD hit the nail on the head, cheers ! would something like Yates Superthrive help it at this stage ?

No mate forget the bunnings crap, go to the hydro shop or buy it on ebay

 

[WinnyBoyBlue]

Bunnings soil is crap for growing dope.
You can save them by using veg hydro nutes like terra vega, starting asap at half strength.

How would I go about watering them with the nutes ? I watered them only yesterday aha, don't want to drown them :/

 

[WinnyBoyBlue]

How would I go about watering them with the nutes ? I watered them only yesterday aha, don't want to drown them :/

I might add I transfered the larger one because I was worried it was outgrowing the cup causing the leaves to go like that, but it just got worse :/ rip

 

[WinnyBoyBlue]

What is that rubbish they are trying to grow out of? Never use poor quality soil when growing cannabis.
The medium is the cause of your issues. Try this next time you can get it from the hydro shop, very simple and great results.

I found a local hydro shop (increadibly cool lady, she totally knew I was growing some dankness). I got a 50L bag of Canna Terra Proffessional (only Terra soil they had) and it was something like $45 AUD, IDK if that's good or not. And I got some Terra Vega as you suggested which was like $34 AUD, I'm gonna wait until I actually flower a plant before I buy Terra Flores

Thanks for he suggestion, I'm really hoping my next batch goes well. Ogh, I also purchased some peat pellet things for the seeds cause the lady said they do well in them and it makes the process easier for beginners. Is it really worth using them as apposed to starting soil. And should I still continue opening seeds by (12-16ish hours in a glass, then 2+days in paper towel until taproots an inch-ish long).

Cheers mayn !