Does marble leach minerals into soil within outdoor tree boxes?

Marble is a popular material for outdoor tree boxes due to its durability and aesthetic appeal. However, a common concern is whether marble leaches minerals into the surrounding soil over time. Marble is primarily composed of calcium carbonate, which can slowly dissolve when exposed to water and acidic conditions. This dissolution process may release calcium and other trace minerals into the soil, potentially altering its pH and nutrient balance.

While small amounts of calcium can benefit some plants by neutralizing acidic soils, excessive leaching could lead to imbalances, affecting plant health. The extent of mineral transfer depends on factors like rainfall, soil acidity, and marble quality. To mitigate risks, gardeners can monitor soil pH and choose marble with low porosity or seal it to reduce leaching. Understanding these dynamics helps ensure healthy tree growth in marble-lined environments.