Are Corten Steel Planters Harmful to Plants and Pets?
Corten steel planters are completely safe for plants, pets, and children. Genuine weathering steel contains no lead, cadmium, or mercury—only harmless iron, copper, chromium, and nickel. The natural rust patina forms a dense, stable protective layer that seals the steel and prevents leaching. Initial rust water (first 1–6 months) provides trace iron beneficial to most plants—only sensitive species may show mild chlorosis, easily prevented with drainage. Pet risks come from sharp edges or standing water, not toxicity. Choose planters with rounded corners, drainage holes (15mm+), raised bases, a
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