Every Master Gardener’s Secret


optimal nutrients when plants need it

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Testimonials

  • This is the greatest stuff since the invention of the light bulb. My garden looks terrific! — Rebeckah A. Iowa City, IA
  • When I put my house on the market earlier this year, my realtor told me I had to do something with my lawn. I bought a 15 pound bag of Central Iowa Organic Fertilizer and spread it on the lawn. The results were amazing in just a few weeks! — Betty C. Indianola, IA
  • This is a great thing. — Wanda T. Wilton, IA
  • I have never had any luck with African violets, but once I started using Central Iowa Organic Fertilizer, my violets are growing like crazy! — Terri S. Indianola, IA
  • These guys are really easy to work with. This is a great product. — Hy-Vee Garden Centers Indianola and Ankeny, IA
  • We have about an inch of soil over sheet rock here in Maine. I used Central Iowa Organic Fertilizer and have gotten things to grow that have never grown before! — Connie M. Damariscotta, ME
  • I put this on my lawn and am mowing three times a week! — Martin B. Indianola, IA
  • Anybody who buys one bag comes back for more. — Ames Greenhouse Ames, IA
  • This is the greatest stuff since the invention of the light bulb. My garden looks terrific! — Rebeckah A. Iowa City, IA
  • When I put my house on the market earlier this year, my realtor told me I had to do something with my lawn. I bought a 15 pound bag of Central Iowa Organic Fertilizer and spread it on the lawn. The results were amazing in just a few weeks! — Betty C. Indianola, IA
  • This is a great thing. — Wanda T. Wilton, IA
  • I have never had any luck with African violets, but once I started using Central Iowa Organic Fertilizer, my violets are growing like crazy! — Terri S. Indianola, IA
  • These guys are really easy to work with. This is a great product. — Hy-Vee Garden Centers Indianola and Ankeny, IA
  • We have about an inch of soil over sheet rock here in Maine. I used Central Iowa Organic Fertilizer and have gotten things to grow that have never grown before! — Connie M. Damariscotta, ME
  • I put this on my lawn and am mowing three times a week! — Martin B. Indianola, IA
  • Anybody who buys one bag comes back for more. — Ames Greenhouse Ames, IA

Safe at any concentration and odor-free


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Fuller bedding plants

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Healthier turf

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Vigorous potted plants


  • Listed organic OMRI certificate available on request
  • Odor-free Perfect for indoor plants as well as outdoor
  • Never burns At any concentration, seed and bedding plants are safe
  • No harmful buildup No problems from over-applying over time
  • Improves soils Structure, drainage and aeration are all improved
  • Promotes microbial activity Free-living, nitrogen-fixing bacteria provide an optimum growth environment
  • Provides growth hormones Castings contain auxins and cytokinins which promote root health
  • Bio-available nutrients Trace elements and the natural structure and high-microbial activity allow our worm castings to outperform NPK fertilizers
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I am a believer in the benefits of worm castings both as a soil amendment, and when used as worm casting tea. I amend my planting sites with castings, and I brew & apply worm casting tea twice a month (sometimes more frequently) during the growing season. Attached are pictures of giant vegetables that I have grown over the years using worm castings

-- Dan Boelman
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A new customer in Iowa City, IA contacted us with a very specific yard problem: Their yard became infested with a non-stinging ground dwelling bee which is a protected species and could not be exterminated. The bees thrive on hard pack, dry soil. The only way to rid the yard of the infestation was to create thick, lush grass and moist soil. They tried over seeding for years and the problem got to critical mass as you can see in the first photo. They heard about worm castings and ordered two 30 pound bags of castings. Besides grass seed, the castings were the only soil restorer used. The second pictures are after six weeks. They put netting over the grass seed to keep the birds from taking the seed.