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How to use blood meal
Test your soil to see if it needs nitrogen.
Buy a simple soil test from your local nursery or garden center and use a sample of soil from your garden or plant container. Follow the test kit instructions to get accurate results.
The test will tell you the levels of nitrogen, phosphorus, and potassium. For example, the test will tell you if there's a surplus of nitrogen, sufficient levels, a deficiency of nitrogen, or if it's completely depleted.