An urban planter box can get too hot in direct sunlight, especially if it is small, shallow, dark-colored, or made of metal or thin plastic. The risk is real in hot climates and on sunny patios, but “cooking” the roots is not automatic. Roots are usually damaged when soil temperatures stay above roughly 30–35°C (85–95°F) for long periods, and the hottest zone is often near the sun-facing wall rather than throughout the whole box. Larger containers, light colors, insulation, mulch, consistent moisture, and afternoon shade greatly reduce the risk. You can check with a soil thermometer at midday and move or shade the planter if it runs hot. In most cases, a well-designed, well-watered urban planter will warm up but not cook its roots.
Will an urban planter box get too hot in direct sunlight and cook the roots?
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