Are yellow veins a sign of mg deficiency?
I'm seeing that on a lot of my outdoor plants.
Easy enough to fix with a foliar, if that's the problem..
Hi Chunky Stool,
It's much more complicated usually. K+ deficiency shows somewhat similar to Mg def. but much less common.
OK...look at a marijuana leaf on the outside saw-tooth edge. starting in the notches inward are the veins. Mg def. shows chlorosis between the veins. Minor but important point.
And marijuana in general and some strains more then others likes lots of Mg. White Widow and related strains will show deficiency if you don't supplement.
So if you haven't been supplementing magnesium and your plants show interveinal chlorosis...it would be a fair guess that it's Mg deficient and yes, foliar or applied to roots via watering can both resolve this.
This is a gross simplification and how the plant looks as the deficienct develops is also part of it. Look it up.
Cheers,
JD