Are cast iron outdoor flower pots prone to leaching metals into soil?
Cast iron outdoor flower pots are popular for their durability and rustic appeal, but concerns about metal leaching into soil often arise. While cast iron is less likely to leach harmful metals compared to materials like lead-glazed ceramics, prolonged exposure to moisture and acidic soils can cause minor iron oxidation. This may slightly alter soil pH but is generally not harmful to plants. To minimize risks, avoid using heavily rusted pots or line them with a barrier. Regular maintenance and proper drainage also help reduce metal transfer. Overall, cast iron pots are a safe choice for most gardeners.
