When designing an urban herb garden, a common dilemma is whether to use one large planter box or several smaller ones. The best choice depends on your specific goals, space, and gardening style.
A single large planter offers distinct advantages. It creates a striking visual centerpiece and can accommodate a diverse "herb community." Plants like rosemary, thyme, and oregano, which enjoy similar well-draining soil and moderate water, can thrive together. A large box also provides a more stable root environment, protecting against rapid temperature and moisture fluctuations. For gardeners with limited time, maintaining one container's watering and feeding schedule is simpler.
However, several smaller planters provide superior control and flexibility. You can tailor the soil mix and drainage perfectly to each herb's needs—sandy soil for lavender, moisture-retentive mix for basil. They allow you to easily move sun-loving herbs into light and shade-preferring ones out of it. Small planters are ideal for compact spaces like railings or windowsills and make it simple to replace or harvest individual plants without disturbing others.
Consider your priorities. Choose one large planter for low-maintenance impact and companion planting. Opt for multiple small planters for maximum control, flexibility, and the ability to curate a diverse collection. Ultimately, the best system is the one that fits your space, meets your herbs' needs, and brings you the most joy in your urban gardening journey.