You should be fine! I've been making my own compost for several years now and it beats the store bought stuff everytime... I've also had my soil tested over the years and I'm usually low in iron and manganese, greensand provides both. I'm not saying that you need it right away or anything, but it would be like your next step or whatever. I think that you will actually do better than most people on here because you didn't add a bunch of trivial things like rock phosphate and bone meal(I hate the stuff). When it's time to recycle your soil, your spent soil would count as the brown material and you would just have to add grass clippings and food scraps. You were right about making the base compost, just grass and leaves will make up 2/3 of your mix, but you still need 1/3 aeration to make potting soil. I've been mixing my worm castings with ProMix 50/50 and it's been GREAT for everything including my seedlings and clones.
My last seed run, I went 33 for 36 seeds and the clones look super happy.
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The outdoor soil I used mostly EWC and perlite. Plus, I had some 2 1/2yr old leaf mold, pure leaf mold. I didn't pay for any fertilizers and I only paid for the peatmoss to fill the worm bins. I saw this as a way to treat the peat before I used it too. Peat straight out of the bag sucks, you gotta work with it first and it will go from red to brown. It's also hydrophobic(repel water) straight out of the bag, so it's PITA to use.
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I found a store that would give me expired produce, but it's kind of slowed down since 'rona...
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My worm bins are about 550gal each, or 2.67 cubic yards. I have 4x worm bins and a 8x12 concrete slab that I use for compost. My goal is to make the leaf and grass compost and then feed it into the worm bins with the food...
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