Cultivation Nation^® Seventy Thirty Growing Media is a mixture of buffered coconut coir and perlite, blended in the classic ratio of 70:30. Coconut coir is known for its water holding capabilities, and perlite is included to provide air spaces in the media, facilitating aeration and drainage. Cultivation Nation^® Seventy Thirty Growing Media is great for use with customized feeding schedules in indoor and outdoor containers.