How to Make Organic Fertilizer


Organic fertilizer is easy to create by combining inexpensive ingredients purchased in bulk from farm supply stores with others made at home. Although well-aged compost provides slow-release nutrients and micronutrients, which improve garden soil over the long term, heavy-feeding vegetables, perennials, and flower bulbs require additional fertilizer to carry them through the growing season. Use homemade organic fertilizer with a balance of nitrogen, phosphorous and potassium for a swift nutrient boost to maximize your garden growing potential.

Step 1

Measure out 4 parts organic seed meal, 1/2 part dolomite lime, 1/2 part gypsum, 1 part wood ashes,1 part bone meal, and 1 part kelp meal, using the large or small flower pots as volumetric measures depending on the quantity of fertilizer desired.

Step 2

Thoroughly mix the measured portions in a wheelbarrow or plastic tub, using a shovel or trowel depending on the size of the pile of fertilizer to be mixed.

Step 3

Add a volume of well-aged yard compost or composted manure equal to the volume of the complete mixed fertilizer ingredients. Stir the pile thoroughly with a shovel until it is evenly mixed.

Step 4

Turn homemade organic fertilizer mix into the top 6 inches of garden soil with a shovel, at a rate of 2.5 gallons per 100 square feet of garden surface--about 1 gallon per 8-foot x 4-foot standard raised bed. Measure out the fertilizer mix with the milk jug or nursery pot.

Step 5

Top dress heavy-feeding crops with additional compost once midway through the growing season. Store any unused organic fertilizer mix in a metal trashcan with a tight-fitting lid.

Things You'll Need

  • Organic seed meal
  • Dolomite lime
  • Gypsum
  • Wood ashes
  • Bone meal
  • Kelp meal
  • Small or large plastic flowerpot
  • Wheelbarrow or large plastic tub
  • Shovel or trowel
  • Compost
  • 1 gallon plastic milk jug with the top cut off, or 1 gallon nursery pot
  • Metal trash can with tight-sealing lid


  • How to Make Organic Fertilizer, The Farm
  • You Can Make Your Own Fertilizer, Backwoods Home Magazine
  • Make Your Own Complete Fertilizer, U. Alaska Cooperative Extension

Who Can Help

  • A Better Way to Fertilize Your Garden: Homemade Organic Fertilizer, Mother Earth News
Keywords: organic fertilizer, homemade fertilizer, make fertilizer

About this Author

Cindy Hill has practiced law since 1987 and maintained a career in freelance writing since 1978. Hill has won numerous fiction and poetry awards and has published widely in the field of law and politics. She is an adjunct instructor of ethics and communications.