How to Mix Coconut Coir Potting Soil


Coconut coir is a byproduct of the coconut industry. Made up of the fibers between the outer hull and meat of the coconut, it offers many of the same qualities to potting mixes that peat moss is prized for. It is sterile, well-draining and also retains these qualities for a number of years. Unlike peat moss, which takes many years to re-form after harvesting, coconut coir is a renewable resource. Substitute shredded coconut coir in any potting mix recipe that calls for peat moss.

Step 1

Place one bushel of shredded coconut coir in a large bucket. Add enough warm water to the bucket to soak the coir, and allow it to sit in the water overnight.

Step 2

Squeeze the excess water from the coconut coir and pour the water out of the bucket. Mix in one bushel of vermiculite with the coir. Vermiculite is a sterile medium available at garden centers.

Step 3

Mix fertilizer with the coconut coir and vermiculite, as they do not offer any nutrients to the plants on their own. Add 1¼ cup ground agricultural limestone, ½ cup superphosphate fertilizer and 1 cup of a slow-release 5-10-5 analysis fertilizer. Mix everything together thoroughly.

Step 4

Fill your planting containers with the coconut coir potting mix. Place any unused mix in a lidded bucket and store until needed.

Tips and Warnings

  • Coir and other soilless mixes dry out quickly in containers. More frequent watering may be necessary to ensure that your plants remain healthy.

Things You'll Need

  • Bucket
  • Vermiculite
  • Limestone
  • Superphosphate
  • Fertilizer


  • Oregon State University: Coir Is a Sustainable Alternative to Peat Moss
  • University of Illinois Extension: Growing Media for Containers
Keywords: coconut coir potting soil, coconut coir fiber, soilless potting mix

About this Author

Jenny Harrington is a freelance writer of more than five years' experience. Her work has appeared in "Dollar Stretcher" and various blogs. Previously, she owned her own business for four years, selling handmade items online, wholesale and via the crafts fair circuit. Her specialties are small business, crafting, decorating and gardening.