Just Add Water! It’s so easy to grow your own Stay Wyld Organics Oyster Mushrooms. Your kit comes fully colonized and ready to fruit so you are going to easily grow your own delicious Oyster Mushrooms. Oyster’s grow fast so you can be harvesting in around 2 weeks. The grow your own Oyster Mushroom kit comes with substrate fully colonized with Oyster mushrooms, a spray bottle, and an instruction booklet.