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Potting Soil Recipes and Soil Reconditioning



From Hobby Greenhouses in Alberta

Agdex 731-5

The Cornell peat-Lite Mix* is formulated for growing topical plants. The Foliage Plant Mix ** and the Epiphytic Mix** formulas are adapted specifically for their respective plant types and are modifications of the original peat-lite mix.

Cornell has used Osmocote 14-14-14 and Peters 14-7-7 fertilizers with the tropical plant mixes with good results. Other fertilizers are omitted with the exception of dolomitic limestone and 20 per cent superphosphate which are added to adjust the pH and to maintain adequate phosphorus levels. A trace element mix is added to assure a balance of minor elements. Trace element mixes can be purchased from specialty gardening centers.

* "Cornell Tropical Plant Mixes" by Russel C. Mott

**L.H. Bailey Hortorium, Cornell University, Ithaca, New York


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.


   Grow Delphiniums from Seed
   Container Gardening


   Garden Loam Potting Soil
   John Innes Potting Compost
   Orchid Potting Mix
   Cacti Pottingl Mix
   Seed Starting Potting mix
   Alpines Potting Mix
   Shade Potting Mix
   Cutting Potting mix
   A. Knutson Potting mixes
   Cornell Peat-lite Mix
   Cornell Foliage Plant Mix
   Cornell Epiphytic Mix
   Standard Potting Mix


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