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you absolutely want to pasteurize it ... although it will be exposed to the elements you want your spawn to have a chance to regenerate and not be more or less composted by all the negative bacterias in it ... once it gets enough momentum going it will work itself out ...
I usually don't pasteurize the bulk substrate that goes into beds. Nature is going to find its balance anyway. If you're colonizing bulk indoors to use as spawn, that should of course be pasteurized. RR
You are planning on making an outdoor bed I assume? You really don't need to pasteurize when outdoors; nature takes care of itself by keeping everything in equilibrium. Just layer your spawn with your poo/straw mix; make sure to have poo/straw on top of your last spawn layer (maybe 2" or so). Water your bed daily, preferably in the morning. Outdoor is about as easy as it gets.
If you plan on spawning some mush blocks outdoors then you will have to pasteurize, but for outdoor beds you don't have to. I never have anyway.
Edited to add: What RR said... ^^^^^^
-------------------- Of course, then there's the problem of eating vermiculite. On the bright side, it makes your poop and teeth glitter. Just pretend it's christmas.
Those mushrooms are fine. Your friend is a pussy.
ive had beds go sour doing that before after raining heavily a few days after spawning ... stripped all my spawn ... after that i began pasteurizing and never had a failed or patchy outdoor grow again ... think im too paranoid now to do that ...
yeah mold was never the problem it was bacteria ... the 2 i had go wonky on me were straw and manure ... so now i also use coir with the manure ... i just feel safer having it in a pocket of pasteurized medium for the first few days / week until it gets its momentum ... then like you said nature works itself out ... it could also be that i used popcorn to spawn and the individual grains werent as consolidated fully as the smaller wbs grains seem to get ...