How does the porosity of travertine compare to granite in outdoor planter use?

When selecting stone for outdoor planters, porosity plays a critical role in durability and functionality. Travertine, a sedimentary rock, is notably more porous than granite, which is an igneous rock. This higher porosity allows travertine to absorb water more readily, making it ideal for planters in dry climates where gradual moisture release benefits plant roots. However, in wet or freezing conditions, travertine's porosity can lead to cracking as absorbed water expands when frozen.

Granite, on the other hand, is far less porous, offering superior resistance to water absorption and weathering. This makes granite planters better suited for humid or cold environments where freeze-thaw cycles are common. While granite provides excellent longevity, its low porosity may require additional drainage holes to prevent waterlogging in plant roots.

In summary, travertine's porosity makes it a better choice for arid regions, while granite's density excels in harsher climates. Consider your local weather and plant needs when choosing between these two stones for outdoor planters.