What are the differences in thermal conductivity between marble and granite planters?

When choosing between marble and granite planters, understanding their thermal conductivity is crucial for optimal plant health and durability. Marble, a metamorphic rock, has a lower thermal conductivity (approximately 2.07 W/m·K) compared to granite, an igneous rock, which averages around 2.6–3.5 W/m·K. This means granite planters absorb and retain heat more efficiently, making them ideal for outdoor use in cooler climates, as they help stabilize soil temperature. On the other hand, marble planters, with their lower heat retention, are better suited for indoor or shaded environments where excessive heat buildup could harm sensitive plants. Additionally, granite's denser structure provides superior weather resistance, while marble may require more maintenance in extreme conditions. Consider these thermal properties to select the best planter for your gardening needs.