If your urban planter boxes didn't come with drainage holes, don't worry - this is an easy fix that will save your plants from root rot and waterlogging. First, gather your materials: you'll need a power drill, appropriate drill bits (carbide-tipped masonry bits for ceramic or concrete planters, standard twist bits for wood or plastic), safety goggles, and a marker.
Start by determining the ideal number and size of drainage holes. For most planters, -4 holes measuring 1/4 to 1/2 inch in diameter work well. Mark these spots on the bottom of your planter, spacing them evenly. If working with ceramic, clay, or concrete planters, place a piece of masking tape over your marked spots to prevent the drill bit from slipping.
When you're ready to drill, put on your safety goggles and secure the planter. For fragile materials, place a scrap piece of wood underneath to support the surface as you drill through. Begin drilling at a slow speed with light pressure, gradually increasing speed as the bit penetrates the material. Keep the drill perpendicular to the surface for straight holes.
For wooden planters, you can drill directly without special precautions. Plastic planters require sharp bits and moderate speed to avoid melting the plastic. If creating multiple holes, periodically clear away debris from the drilling area.
Once all holes are drilled, test your work by adding water to ensure proper drainage. Consider adding a layer of gravel or broken pottery shards at the bottom to prevent soil from washing out while maintaining good drainage. Your urban planter is now ready for healthy planting!