I have recently purchased 4 vinyl raised beds ( 4x4x15). Each bed in lined with weed barrier. Using home dirt is not a option. For each bed I have purchased 6 bags of top soil, 5 bags of compost, 1/2 bale of spaghnum moss, 3 bags of cow compost, 1 bag of coir, 1 bag of worm castings. Sounds like a big soup huh? Question is, how do I layer of mix all of these ingredients? Should I purchase any more ingredients. They are very deep and sit on a slope about 4 inches. I hope you can answer soon because I am planning on filling them this weekend.
Thanks for your help.
50 percent of your 'soil' should be compost.
50 percent can be coconut coir, peat moss, or sphagnum moss.
Part 2 is the fertilizer or food for the plants.
1 bag of worm castings for each 3 x 8 raised bed.
Here are a few links with more information.