Plants dying from the bottom up

[copetegui]

Please help, plants turning yellow at the bottom and leaves are falling off.

3 weeks old
Using biobizz nutrients but were turning yellow before i gave them any

 

[MsSinful]

Hi Copefegui, what type of soil are you using? It could be from a few things, nute burn if the soil is to hot.. those 1st leaves look close to the soil so maybe you splashed them from watering or the humidity went from really high to low so now there drying out.
How old are they? Both plants are already flowering so I'm not sure how much taller they will get.

 

[MsSinful]

Oh sorry, just saw you wrote 3 weeks old.

 

[copetegui]

Using biobizz light mix soil, not sure what happened

 

[MsSinful]

I don't know either, it's ok though each grow is about the things you've learnt. What works and what doesn't.
What strain are these?

 

[copetegui]

Im not sure, i got the sweet mix auto pack that comes with 10 mystery strains

 

[MsSinful]

What size pot are in? Ok cool, so you have some seeds you can germinate still?