Why? You should not need any supplemental nutes if you’re using a well rounded base nute line up which I’m pretty sure cultivation nation is.
I take that back, supplemental nutes are fine but grow big is part of a 3 part itself.. it’s not really a supplement IMO.. It won’t help in any real way on top of another set of base nutes like cultivation nation.
So you can - but there’s no reason to.