HELP! Leaves are turning yellow/burnt

[MaryJane420]

Hi There,

I hope u are well & safe. I am a beginner grower.

I have 2 plants in the seedling stage that have leaves that are turning yellow/burnt at their tips. Images attached. I am not sure what could be causing this to happen and was hoping to seek your help.

I have followed the below process so far:
- Basic Prime Pure Organic potting mix
- Liqui Compost in water to drop the water ph levels
- Mars TSL 2000w - Height: 65cm at 50%
- Water PH Level: 6.5
- Room Temp: 21c - 27c
- Humidity: 50% - 80%
- Grow Room (Wendy House) size: length 2.2, width 1.68


This is my 2nd time trying to grow and I cant seem to get my plants to pass the seedling stage :-(

 

[CaptainWiese91]

Do you have any perlite or leca stones in that soil ?
And are you feeding it nutrients already ?
What about drainage?
To me it looks like the seedling don’t like that soil and/or it’s getting suffocated by the lack of oxygen.

 

[Canuck147]

The Captain is correct - to me your grow medium looks like bark mulch - which cannabis plants will not do well in.

 

[TOKABIGONE]

Once again Captain and I are on the same page. That looks like nute burn. Too rich starting soil and you/re adding nutes? Stop that and pHed water only for at least 4 weeks.. The bag says 3 months of nutes so it is a hot soil.

 

[MaryJane420]

Thank You, Should I change the soil? If so, whats a good soil to use? or should I leave it as is and only use plain tap water?

 

[MaryJane420]

The only nut used was Liqui Compost in water to drop the water ph levels

 

[CaptainWiese91]

Tomato soils is a pretty good starting soil.
Tomatoes want the same Ph as cannabis. And normally have the right nutrients also in the right stages.
I have always been using tomato soil to be honest. And I’m not doing any kind of feeding for the first 10 weeks of veg other than cal mag.

you can get it in all garden stores. Of course the NPK may be different from a company to another. But usually it goes right along with Cannabis

 

[CaptainWiese91]

You need to change the medium. And stop using nutrients if you are doing so.

 

[SoOrbudgal]

Yes that's a bit of a hot mix for tiny plant. If you have decent soil in your area and can't get plain potting mix no nutes, i'd gather up a bucket of good garden soil mix it into that bag of potting soil and add somemore perilite. But yes gotta lower that hot soil not needed for tiny seedlings. Good Luck hope you have more seed?

 

[TOKABIGONE]

There are many better ways to adjust pH both organic and chemical. Do you understand what the label on that bottle is telling you? It's very high in Nitrogen and other nutrients that are killing your plant. Just too hot.

 

[CaptainWiese91]

I have to agree with TOKE here.

 

[homegrown]

Stop giving them any nutes. The grow medium your using is a potting mix..good for annuals and flowers. Not so good for weed. I usually water my seedlings with a PH of 6.2, in coco/perlite, no nutes till i've transplanted. These seedlings are 10 days from soaking in paper towel. They just need water and limited light.