Seed Bomb Phuel- 1kg (Optimized Clay Mixture for Seed Balls and Seed Bombs). More than just red clay; a mixture of minerals and microbial inoculants Provides biological and mineralogical support for seeds and seedlings. Enough for 100s of seed balls! Super easy, just add compost and water, mix it up. Made in Central PA, engineered by a PhD in Soil Science