The Q&A Archives: Recycling Starting Mix

Question: I have old, hard, used seed-starter mix in seed-starter trays. The seeds never germinated. Can this stuff be used again or should I throw it out?

Answer: To be on the safe side, why not add the mix to your compost pile, or sprinkle it around the plants in your yard? When you start seeds, the trays should be sterilized and the mix should be new. That way you won't accidentally introduce diseases to your brand new seedlings. You can use a mixture of one part chlorine bleach and nine parts water to wash your seed starting trays before using them again.

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