It's actually designed for 8x4 raised beds....which I have tweaked to 6 large plants in seven gallon pots.
5-10 mils per plant (closer to 5) is about right on drenches. The gallons don't matter....you just want the drench in the soil.
So, for a normal plant maybe 7mils drench, 1-2mils Tea.....something like that. Lighter on the Tea is fine, but it's annoying.
I'm doing a few things differently in the veg room lately, so I'll get to an update soon.....but I'm incredibly busy right now, to the point of feeling stress! Gotta go.
Ooops! Six plants. I knew that.
How does the kit work as a 4x8 raised bed? Since you start with only 4 cubic feet, are you top-dressing the soil with just 1-1/2" of HB kit soil?
I don't want to add to your stress level so take your time. I could PM you but I thought it might be of interest to others planning their outdoor grows.
I have the Pro-Mix. I won't plant until June 1, but would like to start them in the same soil so will need to get cooking before too long. My plan is to start and veg them for a while matching the photoperiod they'll experience once moved outside June 1st.