I’ve tried to mix/buying all the stuff yourself and the shipping is what is what’s going to kill you. Inless you buy a bunch of bags of same brand or they do a freight version with at least a certain amount that makes the greenhouse company happy. It costs your talking 2-4x more than the product . So sometimes you gotta know or have sources ( when I did it I had to buy like 40 bags of stuff, your talking 3-4 bags of same stuff , very costly and obvious when it came up to my door ) Just matters where u live too and even wha kind of car/truck you got cause you can’t fit much in a sports car lol..
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Suggestion on brand for dry amendment
www.aurorainnovations.org/uprising-grow.html
what your paying for is not only prime source but do the math when you try to buy those products yourself And then mix em. I think I rather even when I buy 10- 40lb version of everything on their list and tried to mix it. Much easier to buy their bags ( 15-35% Moore costly and your time and storage )
I use a bag of each of their main uprising dry ( 40lb ) amendments a season . It’s honestly very nice way to feed and efficient all ways if you looking at that, you could almost just feed only those bases and never feed anything else and never have any issues ( once every 1-2 weeks )
Been using them since they released this line, been a roots organic guy for over 5+ years ( roots, than soul and own every dry line )