As with any garden, soil preparation is what really counts when it comes to being successful growing in containers. It’s the foundation. It’s the staff of life. Pick your life-giving metaphor and you get the idea.
In other words, select the right potting mix recipe for your plants and they will thrive. Skimp on the soil and you’ll get weak, non-productive plants that require more work to maintain and are susceptible to all kinds of pest problems.
What is the perfect mix? That depends. Every professional gardener has his own “secret” recipe just like every Italian grandmother has her own way of making tomato sauce. However, most experts agree that a good container medium should be lightweight and drain well, yet contain enough organic matter to hold moisture and nutrients even through hot, dry weather.
A FAVORITE!
Get your potted crops off to a great start and keep them healthy with premium quality potting soils. Designed to provide root support, moisture retention and healthy nutrients, these organic mixes will give you maximum results.
Note: Ordinary garden soil is not recommended as a potting mix. It’s usually too heavy and may contain weed seeds, diseases, and insect pests.
Commercial Mixes
Most commercial potting mixes are the seller’s best attempt to provide for aeration, water retention and nutrients. Of course, not all commercial soils are the same. The old adage “you get what you pay for” can really come into play here. Avoid inexpensive soils that just say “topsoil” or “compost” on the label. That mysterious topsoil may be anything and could very well be old, tired soil that comes from land that’s been farmed to death. Poor topsoil can be completely depleted of nutrients, but rich in nasty chemical pesticides and herbicides, another leftover from life down on the farm. Something merely labeled “compost” could very well be made from toxic sludge (often called biosolids) or just ground up wood chips and nothing else. Play it safe and buy quality organic potting soil.
So what should you look for? “Certified Organic,” that’s what. Beyond that, look for specific ingredients. Don’t buy mystery soil. Remember the old sci/fi classic, Soylent Green? It pays to know the contents of your food or the food of your plants.
Tip: Store leftover soil in a tightly sealed bag to keep out soil-dwelling pests, like fungus gnats. Read our article Contaminated Potting Soil and Compost to learn more.
Make Your Own
Of course, you don’t have to purchase potting soil. You can make your own. Sure, it’s more work, but it can be more gratifying, plus you’ll know the exact contents of the soil since you’re the one who has mixed it up. A good potting mix recipe contains sterile garden loam, sand, peat moss (or coconut coir) and other additives as needed.
#1 SOILLESS MIX
Not just any grow medium… FoxFarm® Light Warrior is packed with beneficial microbes (mycorrhizae) to stimulate root growth, humic acid to promote seed germination and earthworm castings to help plants thrive. It’s the perfect fast-draining, lightweight mix for your indoor/ outdoor gardens. Available in a 1.0 cu ft bag.
Classic Soil-Based Mix:
- 1 part peat moss or mature compost
- 1 part garden loam or topsoil
- 1 part clean builder’s sand or perlite
The organic material in the above mix provides structure and the sand will improve drainage. A balanced, slow-release organic fertilizer may also be added to the mix.
Cornell Soilless Mix (adapted for organic growers*):
- 1/2 cubic yard peat moss or coconut coir
- 1/2 cubic yard perlite
- 10 lbs. bone meal
- 5 lbs. ground limestone
- 5 lbs. blood meal
* This soilless mix was developed at Cornell University for commercial growers, but is easily adapted for home use. I have substituted select organic fertilizers in place of synthetic fertilizers.
The Perfect Raised Bed Soil Mix
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Recommended Products
Seedling Mix
Provides new plants with the moisture retention and aeration they need.
Worm Castings
Savvy growers know redworm castings to be rich in nutrients and beneficial microbes.
Precision Perlite
Perfect for starting seeds, rooting cuttings or adding to any growing medium.
Coco Coir Bricks
An eco-friendly peat alternative! ProCoir holds 8-9 times its weight in water.
Vermiculite (8qt)
Use to root cuttings or to offer any plant more air capacity for healthy growth.
Humic Acids (Granular)
Harvested from a huge deposit of decomposed plant life from millions of years ago.
Sphagnum Peat Moss
Perfect for acid-loving plants like azaleas, rhododendrons, roses and conifers.
Oyster Shell Flour
This crushed mix ensures rapid and long-term release of calcium for stronger plants.
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6 Responses to “The Perfect Potting Mix Recipe”
Wonderful information! We’re starting our first organic garden. Have learned so much!
Thanks for the great info. I think the coconut coir is much better than peat for moisture and drainage qualities. Your recipe seems like the base ingredients in world famous “Super Soil”. I just mixed up a batch and it will be done cooking in three weeks.
What do you mean cooking?
I’ve been gardening for over 60 years. Gone through various stages. Now doing container gardening, almost exclusively. I have about 30 plants surrounded by chips and used mix, all in raised bed. Gets very hot here. Still don’t have the yield I had when I first planted in dg and knew very little. We had a 4 yr drought in ca. I also plant in planter box w/h2o reservoir. Needs soilless mix does pretty. Now after over 30 yrs planting lm chasing the sun. I love trees and planted many. I’m thinking of using outside grow lights, my family thinks that’s crazy. Jackie
Excelente, me parece muy bien lo que ustedes están haciendo.
Yo soy un aficionado a los trabajos del huerto
Would your Cornell soilless mix for organic growers be a good choice for vegetable grows in 7 gallon grow bags in zone 7a outdoors?