If I can't help you directly try following my step by step method 1. lay out your tarp, 2 open one bag of compost and spread thinly across your tarp. 3. tap out any lumps 4. open another bag of compost and spread it over the first taping out lumps. 5. add your peat moss to the tarp and spread it over the compost, once again taping out the lumps. 6. Carefuly grab an end of the tarp and lift it up and help the mix on the tarp mix together. 7 When mixing move from both ends and the two sides. when you can't move the piled up soil any more spread it thinly over the tarp again. 8. Add in the rest of the compost and mix completely by lifting the tarp and letting the mix roll over it's self . 9. add in vermiculite, spread gently over the whole tarp. We don't want to brake this up any more than we have to. Gently move the tarp back forward to mix and gently spread it over the tarp thinly and mix again.Spread the mix out across the tarp again 10 When it all looks like salt and pepper it's ready. Add it to your garden box. You can mix 4 cubic feet of compost, 4 cubic feet or peat moss and 4 cubic feet of Vermiculite in one batch.
2nd year soil
This is just too easy. Use compost with at least 5 different ingredients.
Don't add vermiculite, or peat moss. Once is enough.
It's easy square by square. REMOVE a plant add a scoop of compost. I keep a trash can full of compost by each garden area and fill it up when it gets low.