H. M. Holloway Inc.

We provide soil amendments (gypsum, compost, lime, sulfur, and humics) with a full service delivery.

  • About
  • About
    Providing agriculture gypsum and other soil amendments to growers since 1932. We own and operate our gypsum mine located in Lost Hills CA. Our gypsum, sulfur, lime, compost, and other ag products are OMRI approved. Our mission is to help California grow with high-quality and cost efficient products, services, and solutions that benefit the communities and help preserve the natural beauty of the Golden State.