Hedelcomposite is composed of sterilized residual sawdust and inoculated with mycelium. Ready to use. Grow your own biodegradable mycelium objects with Hedelcomposite in just one week! Check out our growing guidelines for tips and tricks on how to grow. Hedelcomposite needs to be stored airtight and cool (max. 4ºC) until usage. Process your material within 3 weeks after receipt.