Coir is a popular substrate choice for indoor cultivation due to its many benefits. First, it has excellent water retention and drainage capabilities, allowing growers to easily adjust the moisture levels in their grow medium as needed. Coir is lightweight yet durable enough to hold up against regular handling and manipulation. It is naturally sterile and free of any contaminants or diseases that could potentially harm plants. Coir can be re-used multiple times which helps save money on purchasing new soil or other substrates each time crops are harvested. All of these advantages make coir an ideal choice for indoor cultivators looking for a reliable and cost-effective substrate solution.