User Guidelines

Using any new product can be confusing. Fear not; there are instructions for use.on the back of every bag, but if your bag is not readable, we’ve got you covered.

Central Iowa Organic Fertilizer’s earthworm castings are an excellent all natural plant food that comes to you directly from Mother Nature in the purest form. For millions of years the incredible earthworm has been one of nature’s greatest producers of readily available plant food. When used in greater than usual concentrations than found in nature, this non-burning, long lasting organic fertilizer can provide remarkable results.


Vegetables and Annual Flowers
Line bottom and sides of plant holes and seed furrows with 1″-2″ of earthworm castings. Set seeds or plants in place and cover with soil. Side dress during growing season at a rate of 1/2 cup per plant or 1 cup per linear foot of row once every two months.

Work 1/2 cup into the soil above their root zone taking care not to damage shallow roots. Apply in spring, early summer and fall.

Potted Plants and Seeds/Seed Flats
New-Potting Mix-use 1 part earthworm castings to 3 parts soil.

Potted Plants, Window Boxes, or Hanging Baskets
Established-Add 1″-2″ of earthworm castings to top of soil. Mix in taking care not to damage shallow roots-water-repeat every two to three months.

Roses, Trees, Shrubs, and Berries-New or Freshly Transplanted
Mix 1 part earthworm castings to 3 parts soil. Surround newly dug hole with mixture. Spread roots over a mound of the mix in the hole and cover.

Mix 4 cups of earthworm castings into soil 2″-3″ below the surface for each plant.

Apply 10 pounds per 100 sq. ft. Work lightly into the topsoil. Mix in grass seed and water well.

Distribute as top dress 10 lbs. per 100 sq. ft.

Casting Tea
Soak 1 part castings in 3 parts water for 12-24 hours. Stir well and water as usual. Casting tea is excellent for fruiting, flowering, or difficult to access potted plants.

Compost Piles
Spread a thin layer of earthworm castings between each new layer of material to be composted.

Remember, it’s impossible to make a mistake with Central Iowa Organic Fertilizer’s earth worm castings because it won’t burn your plants or lawn.