Benefits of Coco Coir
Retains moisture and provides a good environment – coco coir is one of the most effective growing media for water retention out there. It can absorb up to 10x its weight in water, meaning the roots of your plants will never get dehydrated.

In your garden or for your potted plants you can mix up to 40% coir with your soil or potting mix.
Make your own seed starting mix–for starting small seeds it is best to use fine pith coconut coir.

Coir is nice on its own but even better when combined with other amendments such as rice hulls and perlite. Using them in combination will provide you with the best results in drainage, aeration, and water retention.
Coir also makes a great worm bin bedding!