The best soil mix for most urban planter boxes is a light, well-draining, nutrient-rich blend rather than garden soil. A reliable base recipe is 60% high-quality soilless potting mix, 20% finished compost, 15% perlite, and 5% coconut coir. This combination holds moisture without becoming soggy, allows excess water to drain freely, and stays lighter than garden soil, which matters on balconies and rooftops. For vegetables and flowering plants, add a little more compost or a slow-release organic fertilizer. For herbs, reduce the compost slightly so growth stays compact and flavorful. For succulents and Mediterranean herbs such as rosemary and thyme, increase perlite to 30–40% and skip the coco coir. Always use planter boxes with drainage holes, and top-dress the soil with mulch to reduce evaporation. If the mix compacts after a season, refresh it with compost and perlite before replanting.
What's the best soil mix for an urban planter box?
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