Mixing soils???

Hey there AlternateRick , that should be totally fine , the only trouble i see if the packages are already open is that they're probably contaminated with white fly bugs. It's not your fault but i noticed they always appear after a while. The big advantage with "horticulture-grade" soil is that it's steamed meaning sterilized meaning no bugs. So what you want to do is basically take the soil and spread it out on a tarp and leave it out in the sun for a few hours, the insect eggs will hatch and the bugs will fly away which does help down the line with bugs and pests. does that make sense? hope this helps ! 🚀