North Spore 'Mastr Mix' Sterile Soyhull & Hardwood Bulk Substrate

- FLEXIBLE SUBSTRATE: Suitable for a variety of mushroom species including oyster mushrooms, shiitake, maitake, pioppino, king trumpet, chestnut and more... - PROPRIETARY BLEND: After over a year of research and development we have created this proprietary substrate blend that has faster colonization times than historic hardwood and soyhull based substrates - PROFESSIONAL PROCESSING: Our 'Mastr Mix' substrate is pasteurized and cooled in laboratory grade positive pressure clean rooms maintained to specific ISO standards. - QUALITY: All batches are bacterial load tested by our quality control team before they leave our facility to ensure a clean product for our customers.