At our planter box factory, we understand that drainage is the heartbeat of plant health. For large rectangular planters, we offer a dual approach: every unit comes with pre-drilled drainage holes as a standard feature, but we also provide full customization to match your specific needs. The pre-drilled configuration typically consists of evenly spaced 1-inch holes along the bottom channels, positioned to prevent waterlogging while maintaining soil retention. However, because different plants and climates demand different moisture levels, we allow you to specify hole size, number, and placement before production. Whether you need extra holes for succulents, fewer for moisture-loving ferns, or a custom slot pattern for trough-style planting, our CNC drilling station adjusts in minutes. We also offer optional internal gravel trays and filter fabric liners to complement your chosen drainage setup. Every large rectangular planter leaves our facility with clean, burr-free holes and reinforced edges, ensuring years of reliable performance. So the answer is yes: our drainage holes are both pre-drilled and endlessly customizable—just tell us your vision.