If you're dealing with water draining from your urban planter boxes and making a mess of your patio below, don't worry—it's a common issue with several effective solutions. The key is to manage the drainage *within* the planter to prevent overflow.
First, consider using a liner. A simple, durable plastic liner (like a pond liner or heavy-duty plastic sheeting) placed inside the planter box can contain water. Poke a few small drainage holes in the liner's bottom *only*, and ensure it's tucked neatly over the edges. This directs water down through the soil and out the planter's built-in holes, not over the sides.
For a more integrated solution, create a "false bottom" or reservoir layer. Place a layer of gravel, hydro stones, or broken pottery at the bottom of the planter before adding soil and your liner. This layer catches excess water, allowing it to be absorbed by the soil gradually or evaporate, reducing the amount that drains out immediately.
Another crucial step is checking and possibly modifying the existing drainage holes. They should be clear and adequate. If water pours out too fast, consider adding a permeable landscape fabric over the holes inside the planter. This slows drainage, lets soil absorb more water, and prevents soil loss.
Finally, mindful watering is your best daily practice. Water slowly and deeply until you see just a trickle from the bottom holes, then stop. This prevents saturation and overflow. Using saucers or trays designed for large planters can also catch the initial drip, protecting your patio surface.
By combining a good liner, a proper internal drainage layer, and careful watering habits, you can enjoy your lush planter boxes without the unwanted patio puddles.