Tea Seed Pellet (TSP) is an organic NPK fertilizer. TSP is the residue of tea seeds (camellia seeds) after the oil extraction process. The active ingredient in TSP is tea saponin. This is known to suppress earthworm activity reducing worm casting on sports turf surfaces. As a 100% organic plant based fertilizer, TSP has a max. 4% total NPK and 80% organic matter.