Burpee 72 count coir pellets just drop in and add water-they expand in minutes to fill any shape container. The unique blend of soils is specially formulated to get your seeds off to the best start possible holding more water and with better air circulation than ordinary peat. Expert Tip: Place Super Growing Pellets flat-side down and add warm water slowly for maximum expansion. The is best used with celled seed starting trays for all indoor sown products. Our new and easy super growing pellets take the mess out of starting seeds.