When selecting urban planter boxes, proper drainage is non-negotiable for plant health. First, look for an adequate number of holes. Small to medium planters should have at least one hole per square foot of soil surface. Larger boxes need multiple holes spaced evenly across the bottom. The size of the holes matters too; they should be large enough to allow water to flow freely but not so large that soil washes out—typically between 1/4 to 1/2 inch in diameter. Check the placement. Holes should be on the true bottom surface, not just on the lower sides, to prevent water from pooling. If the box comes with a saucer, ensure it is removable or has a gap to avoid the pot sitting in stagnant water. Material is also key. While plastic and fiberglass often have pre-drilled holes, wooden and metal planters may require you to add them. For wood, ensure holes are drilled and consider a liner to prevent rot. Finally, always use a layer of coarse gravel or pot shards at the bottom and a well-draining potting mix to complement the physical holes. Good drainage prevents root rot, fungal diseases, and ensures your urban greenery thrives.
What should I look for in terms of drainage holes when buying urban planter boxes?
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