Winter frost can be harsh on urban gardens, but your planter boxes don't have to suffer. Start by selecting the right materials. Wooden and thick plastic planters offer better insulation than terracotta or metal, which conduct cold. When frost is forecast, move lightweight containers to a sheltered spot against a warm wall or under an eave. For stationary boxes, insulation is key. Wrap the sides with materials like bubble wrap, burlap, or horticultural fleece, securing them tightly. This creates a protective air barrier. Don't forget the roots. Apply a thick layer of mulch—such as straw, bark chips, or shredded leaves—on top of the soil to regulate temperature and moisture. For sensitive plants, use cloches or create a simple frame covered with frost cloth overnight. Watering wisely matters too. Water the soil deeply during a warm afternoon before a freeze; moist soil retains heat better than dry soil. Avoid fertilizing in late fall, as new growth is more frost-tender. Finally, group planters together to create a microclimate. With these steps, your urban container garden can emerge healthy and ready for spring.
How do I protect my urban planter boxes from frost during the winter?
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