The best potting soil for herbs is the one with the correct pH balance. These plants tend to feel great between pH levels 6 and 7, as this enables them to absorb the nutrients they need to grow and thrive. Accordingly, if your soil mix is too alkaline, consider adding sulfur to lower the pH.

Ideally, the best potting soil for herbs will be lighter and be able to retain lots of moisture since pots quickly dry up. At the same time, it will be well-draining, so no excess water sits. You can’t just take garden soil and bring it inside. You need sterile soil that won’t have any critters from outside infesting your indoor herb plants.

While a good potting mix (such as Burpee's Premium Organic Potting Soil from Amazon) should be just fine for most herb planters, you can also create your own. To do so, gardening expert Tony O'Neill of Simplify Gardening recommends combining good-quality compost, coir, and perlite or vermiculite. Keep the ratios roughly equal.