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I've heard of people adding worm castings to their garden soil, but what happens if you're on the worm casting extreme, and plant directly into worm castings?

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While vermicompost does provide many nutrients it will not provide all the nutrients that plants need to grow properly. For instance, vermicompost lacks magnesium; also consider it's pH is roughly >=7 which is neutral, if not akaline, on its own. Most plants enjoy growing in a medium which is slightly more acidic (5.5-6). So while you might find some success planting directly into vermicompost I believe that if you compared the growth of the same species of plant in, say.. a 50/50 mix of vermicompost and peat, then you would see: healthier, faster and more vibrant growth from those plants then you would from the ones that have been planted directly into vermicompost.

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