what's wrong with my hygro?

Usually holes like that are from lack of K. You say you "does a lot". How much is a lot?? What kind of K are you doseing??
 
I'm think potassium also, but even other element deficiencies like magnesium will look like iron or potassium, because they're lack of will prevent plants from utilizing available metals.
 
i'm dosing k2so4 from rex griggs. i'm dosing at least 10ppm every other day.

Still think it is lack of K (potassium). How are you measuring 10ppm??
 
it looks like a K problem to me too. but i dont understand why

I am now stumped too.

Let's try another kind of K.

I think artifical salt is K also. Not sure is that is usable.

Hello--Tom Barr???
 
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