Seed-’s Exclusive Seed Bomb Phuel will supercharge your seed balls. Made with a scientifically optimized mixture of minerals and microbial inoculants, you can ensure that each seed ball gives the seed an optimal germinating environment. To make 100s of 1/2" seed balls, mix with your own compost with the recipe on the bag. Seriously green. Why "Ph" in Phuel? Ph is for "phyto," latin for plant. Ships the next business day via USPS Priority Mail!