Question.

[Pmoe90]

Any idea what's wrong with my plants? These are the only two that are yellowing on the tips. They stay outside

[Speedygreen]

Have u checked closely the under sides of the leaves?

[Pmoe90]

It's the same under the leaf as well. Someone said it could be water burn (never heard of yhat) but it makes sense because I do spray the top of my plants.

[Kaching]

That looks like nute burn to me

[Minoo96]

Hi, try to write your question in the title, just "question" isn't very helpful to know whats the problem without even clicking. Nute burn or water burn also (water droplet and sun tend to burn the leaf, especially young ones like that). To avoid just make sure no water get on the leafs when you water.

Also root problems can look like anything, if you overwater and roots are rotting, it might look like anything.

[Pmoe90]

The water burn makes a lot of sense. Sense this is my first grow I'm learning along the way. I would water my plans then spray the top of them. I won't be doing that anymore. Can these two come back from this?

[Minoo96]

They should. I've seen worst apart from burnt leafs they look a healthy (abnormal growth, slow growing, decay etc are sign of unhealthy plants.)

[oldjarhead100]

outside could be bugs as well

[novacare]

Question: if I put co2 into the grow room will that also provide the o2 the roots should have ?

[Aloner]

No, it won't. CO2 is carbon dioxide; the roots need oxygen.