Sulfur - a naturally occuring element that controls fungi by preventing germination.
Horticultural Vinegar - stronger than household vinegar, it kills weeds on contact.
Corn Gluten Meal - a by-product of corn that prevents the germination on dandelion and crabgrass seeds.
Soap/Fatty Acids - Fatty acids in soap (herbicidal and pesticidal) affect the cells of plants and insects, causing death.
Diatomaceous Earth - a powder made from crushed fossils of marine organisms. Each particle has tiny, sharp edges that kill many types of insects.
Borax (Boric Acid) - a white powder mined from deposits in the earth which attacks the nervous system of insects.
Nematodes - microscopic worms that attack most types of grubs in the soil.
Prytherum - a toxin made form Prytherum daisies that is effective against a wide range of insects.
Mineral Oil - coats and kills insects growing on plants, but may also kill beneficial insects.
Bacillus Thuringiensis - a naturally occuring bacterium that attacks the digestive system of insects.