Coir Brick Large 550GMSA coir brick is a compressed block of coconut coir, a versatile and eco friendly material used in gardening. Here's how you can use it: Hydration: Soak the brick in water to expand and make it usable. Growing Medium: Ideal for potting mixes, a substitute for peat moss. Soil Amendment: Improves soil structure and water retention. Seed Starting: Creates a healthy environment for seed germination. Mulching: Regulates soil temperature, suppresses weeds.