I have 21 day old plants that I noticed yesterday the bottom leaves are turning yellow
I have not been using any bites for the last 21 days just water no nites and ph 6.2
I’m pretty sure it’s nutrients deficiency?
Will they be ok if I start using nutrients
I mean this won’t ruin plants yet if I fix the nutrients problem correct?
And also once I do water with nutrients how many days should it take to get the plant back to green color?
1 or 2 days or a bit longer?
Some pictures would be helpful. I would guess it’s a nitrogen deficiency based on your description. The yellowed leaves will never recover. You will want to look towards new growth for the current state of the plant. Depending on what medium you are in it may be the case that you are starting to feed late so yes they will be okay if you feed, pending pictures and some more info.
leaves don’t restore themselves but if it’s just lite green it should darken up. Here’s a couple pics that should be a part of everyone’s arsenal
Pictures in white light will be necessary to diagnose your issue.