Rainbow Mulch is a division of Wells Manufacturing Co., LLC. For over 75 years, Wells Manufacturing has been making American-made products designed for safe and sustainable use, including sponger rubber. Decades of tradition, coupled with a new vision, created the only sponger rubber mulch product, Rainbow Mulch. Market research and community feedback revealed most available mulch products were made from recycled rubber tires, hospital flooring, or contained toxic chemicals. Rainbow Mulch provides a mulch solution for home projects, landscaping, businesses, schools, and playgrounds that is 100% American made, visually pleasing, long lasting, and safe. Rainbow Mulch is ASTM compliant (safety test ASTM F1292-18). ASTM provides the certifications and testing for national playground standards.