How does the thermal expansion of concrete compare to natural stone in outdoor planters?

When selecting materials for outdoor planters, understanding thermal expansion is crucial for long-term durability. Concrete and natural stone react differently to temperature changes, impacting their performance in outdoor settings.

Concrete has a higher coefficient of thermal expansion (CTE) than most natural stones, meaning it expands and contracts more significantly with temperature fluctuations. This can lead to cracking or structural stress over time, especially in extreme climates. On the other hand, natural stone, such as granite or limestone, typically has a lower CTE, making it more stable and less prone to thermal damage.

For outdoor planters, natural stone often provides better resistance to weathering and temperature changes, while concrete may require reinforcement or sealing to mitigate expansion effects. Choosing the right material depends on your climate and maintenance preferences.