Bordeaux mixture in hydro medium

[_tessarecting]

Can the Bordeaux mixture be used in your res like dutchmaster zone or is it sstrictly for foliar?

 

[neongreen]

99% sure it's strictly foliar...

 

[_tessarecting]

I figured because of the lime.

I've been tryin to find a way to use copper sulphate without killing my plants.