When you're starting your balcony or patio garden, the array of urban planter boxes can be overwhelming. You might consider size, material, or style first. However, the single most important feature you must prioritize is effective drainage.
Without proper drainage, water accumulates at the bottom of the planter, leading to saturated soil. This creates an environment where roots cannot access oxygen, causing them to rot and ultimately killing your plants. A simple drainage hole is your garden's lifeline, allowing excess water to escape and preventing a host of problems.
While materials like cedar, metal, or composite are chosen for durability and aesthetics, always ensure they include or allow for drainage holes. Self-watering boxes are popular, but they still rely on a regulated drainage system. For truly healthy plants in your urban oasis, let the water flow out. Start with this fundamental feature, and your first foray into container gardening will be set up for success.