About Inch by Inch

We are Inch By Inch Worm Castings— a Tucson, Arizona-based vermiculture business whose mission is to produce and sell the highest quality soil supplements made of worm castings and liquid leachate. We grow worms and worm by-products under carefully controlled conditions to assure highest quality, and add no synthetic products to our soil supplements.

We believe the soil in which we grow food and plants should be treated with respect and enhanced by the addition of the world’s oldest and best material. Our worms and their food supply are not treated with pesticides, wormicides, or any other chemicals. We add nothing to the final product of pure, organic castings.

Our Products

Inch by Inch vermicompost products are designed to produce maximum yield, plant health and soil enhancement. Earthworm castings—unlike manufactured fertilizers that only combine percentages of nitrogen, potassium and phosphorus—add over eighty minerals and micronutrients that have been stripped from our agricultural fields over time with the use of commercial fertilizers.

The castings are time-release, still yielding nutrients months after planting. They don’t burn plants, are safe to use in low to high concentrations but work optimally at between ten-twenty percent of planting soil mix, making them very cost-effective. They can also be used after planting along the drip line.

Finally, castings biologically improve the roots’ ability to absorb nutrition from the soil, and help prevent pest invasion of the plants. We also offer other products mixing first generation materials with the castings for balancing, mineral enhancement and pH adjustments in specialized applications.


michael morse

Sandra Morse has a long career working with people individually and in groups as a communication consultant. Her family has been in the citrus business for sixty years, and Sandra grew up watching the business plant, cultivate and harvest lemons, oranges and grapefruit for commercial distribution. She has maintained a lifelong passion for planting, including vegetable and fruit gardens, fruit trees, and ornamental plants.

Michael Morse was, for many years, a tennis professional, working at various locations but with a long run at a clay court tennis club in Tucson. He developed an understanding of the effects of soil erosion and water usage while maintaining the clay courts at his club. Michael has worked with local cattle and horse operations and fresh food purveyors to secure the best food sources for the worms, and oversees the feeding and watering of the worms and the processing of the castings produced.

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