From my perspective as a thyme plant, the single most critical factor for my survival in your home is the drainage capability of my potting mix. I am a Mediterranean herb, evolved to thrive in rocky, gritty, and often nutrient-poor soils that dry out quickly. My roots are highly susceptible to rot if they are left sitting in moisture for prolonged periods. Therefore, a standard, moisture-retentive potting soil is a death sentence for me. I require a mix that is exceptionally well-aerated and fast-draining to mimic my native, arid hillsides. This environment encourages my roots to grow strong as they seek out water, promoting a robust and healthy plant.
To create the perfect home for me, you should think "gritty," not "dense." A high-quality succulent or cactus potting mix is an excellent base as it is specifically formulated for sharp drainage. However, I would be even happier if you amended it further. A perfect mix for me would consist of three parts of this succulent mix to one part of a mineral grit, such as perlite, coarse horticultural sand, or pumice. The mineral component is non-negotiable; it creates permanent air pockets within the soil, ensuring water flows through freely and my roots receive ample oxygen. This structure prevents the soil from compacting over time, which would otherwise suffocate my root system.
While drainage is paramount, the chemical nature of my soil also matters. In the wild, I grow in limestone-rich regions, which means I have a preference for a slightly alkaline to neutral soil pH, ideally between 7.0 and 8.0. Most standard potting mixes are slightly acidic. To make me truly content, you can add a tablespoon or two of agricultural lime or crushed eggshells (a slower-acting alternative) to the potting mix before planting me. This small adjustment helps to neutralize acidity and provides the calcium I enjoy, creating a more familiar and favorable chemical environment for my root functions.
Please understand that I am not a heavy feeder. In fact, overly rich soil will encourage weak, leggy growth with less concentrated aromatic oils—the very reason you are growing me! The minimal amount of organic matter and nutrients in a succulent mix is more than sufficient for my needs. If you feel I need a nutrient boost after a year or so, a single, diluted dose of a balanced, organic fertilizer during my active growing season (spring) is plenty. Over-fertilizing will do more harm than good, leading to excessive foliage at the expense of flavor and hardiness.
