Choosing the Right Potting Mix

There are four basic kinds of potting mix, but how do you know which one you need? Which is the best for long-lived plants? What's the fuss about peat? Are peat-free mixes any good? Here are the pros and cons.

Excerpted from Simple Steps: Containers for Patios
Filed under: Container Gardening

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Loam Based Potting Soil Equipped for Large Plants

Loam-Based Potting Mix

Also called soil-based potting mix, this is made from sterilized loam. It's often available in different recipes or strengths, ranging from formulations for seeds and cuttings to high-fertilizer formulations for long-term, large plants such as shrubs. Loam-based potting mix retains water and nutrients well. Start fertilizing potted plants after three months, when the nutrients run out.

Advantages
- Different blends are formulated for different types of plants.
- Holds water well.
- Contains good supply of nutrients.

Disadvantages
- Bags are heavy.
- Incorporates small quantities of peat.
- Variable quality. Check reviews of brands in the gardening press.