Potting Soil Recipes and Soil Reconditioning

 

Material 1 cubic meter
Sphagnum peat moss (screened 1/2 inch mesh) 0.5
Horticultural vermiculite (No. 2) 0.25
Perlite (medium grade) 0.25
Ground dolomitic limestone 4.9 kg
Superphosphate 20% (powdered) 1.2 kg
Fertilizer (10-10-10) 1.6 kg
Iron sulfate 0.4 kg
Potassium nitrate (14-0-44) 0.6 kg
Granular wetting agent 0.9 kg

 

Cornell Epiphytic Mix

The Cornell Epiphytic Mix was developed for plants that require good drainage, aeration and have the ability to withstand drying between warterings. Plants having coarse, tuberous, or rhizomatous roots are in this category.

 

Material 1 cubic meter
Sphagnum peat moss (screened 1/2 inch mesh) 0.33
Douglas, red or white fir bark* (about 0.5 cm size) 0.33
Perlite (medium grade) 0.25
Ground dolomitic limestone 4.2 kg
Superphosphate 20% (powdered) 2.7 kg
Fertilizer (10-10-10) 1.5 kg
Iron sulfate 0.3 kg
Potassium nitrate (14-0-44) 0.5 kg
Granular wetting agent 0.9 kg

 

* Fir bark comes from Douglas fir, white or red fir, or redwood, ground and screened to a definite size. Finally ground bark (about 0.5 cm) has a dry weight of about 200 g per liter cube. Fresh bark has a pH of about 5.0. Upon weathering, it becomes slightly more alkaline. The bark contains some nutrients, but these will not meet the requirements of growing plants.

 

Listing of potting soils and what they are used for.

Articles

   Grow Delphiniums from Seed
   Container Gardening

Recipes

   Garden Loam Potting Soil
   John Innes Potting Compost
   Orchid Potting Mix
   Cacti

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