Mushroom Grain Spawn - Button Grow your own delicious, pure white button mushrooms throughout the year! The Mushroom Grain Spawn means you can grow your own mushrooms from home throughout the year at just a fraction of the cost! Button mushrooms are a popular white variety from the mushroom family. These button mushrooms hold their flavour and adapt perfectly to any dish. White Button mushrooms are completely versatile when added as a pizza topping, marinated and grilled. Mushrooms are tasty, low in calories, high in protein and a great source of fibre especially for those on plant-based diets. They provide you with vital vitamins including vitamin B, selenium, potassium, and copper. With our handy kits, you’ll soon have this delicious and health beneficial vegetable at just the fraction of the cost.