Absolutely! Growing plants with different soil pH requirements in urban planter boxes is not only possible but a fantastic strategy for maximizing your limited space. The key advantage of using individual containers is isolation. Each planter box acts as its own ecosystem, allowing you to customize the soil mix precisely for its resident plant. For instance, you can fill one box with an acidic mix (rich in peat moss) for blueberries and another with a sweet, alkaline mix (with garden lime) for lavender, placing them side-by-side on your patio.
To manage this successfully, start by researching the specific pH needs of your chosen plants. Use a simple soil test kit to monitor each box's condition. You can amend the soil over time; add sulfur to lower pH for acid-lovers or lime to raise it for those preferring alkaline conditions. Consider using fabric pots or boxes with excellent drainage within a larger decorative planter for easy swapping and root health management. This modular approach empowers you to create a vibrant, diverse urban garden tailored to every plant's unique needs, all within the versatile framework of planter boxes.