This fascinating mushroom (Pleurotus ostreatus) is a cold-weather Oyster Mushroom. It produces beautiful, dark blue mushrooms that lighten in color as they mature. Requires temperatures of approximately 10-25°C to produce. Freezing is not harmful to this variety. Nutrition and wellness fact: Blue Oyster mushrooms contain a plethora of valuable nutrients, including proteins, amino acids, antioxidants, vitamins and minerals. They are rich in vitamin B and vitamin D. Iron and potassium are also present in these mushrooms. Research has shown that Oyster mushrooms help lower LDL cholesterol significantly and help reduce the secretion of inflammatory markers throughout the body.