sizzzlin said:

That is what I used for the entire bed. OSF is Oyster shell flour

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In that case your going to want to add more amendments. Neem, kelp , crab , oyster shell you can use those all at 1 cup per cubic foot. Crab shell is essentially pure calcium just like oyster shell so I don’t think you need both. the rock dust I would use at least 2 cups per cubic foot.