What are the differences in mold resistance between granite and concrete outdoor planters?

When selecting outdoor planters, durability and mold resistance are critical factors. Granite and concrete are popular materials, but they differ significantly in their ability to resist mold. Granite, a natural stone, is non-porous and highly resistant to moisture, making it less prone to mold growth. Its smooth surface also prevents water retention, further reducing mold risks. Concrete, on the other hand, is porous and can absorb water, creating a favorable environment for mold if not properly sealed. While sealed concrete planters can improve resistance, they still require regular maintenance to prevent mold. In contrast, granite planters offer long-term mold resistance with minimal upkeep. For gardeners prioritizing low-maintenance and mold-free solutions, granite is the superior choice. However, concrete remains a cost-effective option if properly maintained. Consider your climate and maintenance preferences when choosing between these materials for your outdoor planters.