As the growing season winds down, giving your urban planter boxes proper attention is crucial for their longevity and next year's success. Start by removing all spent plants and roots to prevent diseases and pests from overwintering. Discard diseased plant material in the trash, but add healthy debris to your compost pile.
Next, empty the soil from your containers. You can refresh this soil by amending it with compost and storing it in bags for the winter, or use it in non-edible garden beds. This is the perfect time to scrub your planter boxes with a mild bleach solution (one part bleach to nine parts water) to disinfect them, eliminating any lingering pathogens. Rinse them thoroughly and let them dry completely.
Inspect your planters for cracks or damage. Make any necessary repairs now so they are ready for spring. If your containers are not frost-proof (like terra cotta or ceramic), move them to a sheltered location like a garage or shed to prevent cracking from freeze-thaw cycles. For large, stationary boxes, consider covering them with a tarp or burlap to protect them from harsh winter elements.
Finally, take a moment to reflect on the past season. Note which plants thrived and which struggled. This will inform your planning for a more productive and beautiful urban garden when the next growing season arrives.