Styrofoam is not recyclable in city waste programs and they will not break down like organic items. If you are wondering how to compost styrofoam, think twice since it can be potentially hazardous to living organisms. They are simply fluffed up plastic and plastic is a petroleum product and is not compostable therefore, composting styrofoam is not possible. If you just want to get rid of styrofoam, consider repurposing it since the stuff makes great insulation for greenhouses and cold frames.

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Source: Gardening Know How