If you have a pet and are diving into urban gardening, choosing the right planter box materials is crucial for their safety. Some common building supplies can pose serious health risks to your furry companions.
First, avoid pressure-treated wood, especially older types containing arsenic (CCA). While newer ACQ-treated wood is less toxic, the copper can still cause stomach upset if chewed. Similarly, wood treated with creosote or pentachlorophenol is highly toxic and should never be used. For metal planters, be cautious with copper. While beautiful, it can be toxic if ingested in large amounts and may leach into soil. Galvanized steel coated with zinc is another concern, as zinc toxicity is dangerous for pets.
Railroad ties and recycled plastic lumber of unknown origin may contain harmful chemical residues. When using any plastic containers, ensure they are food-grade or labeled as safe, as some plastics can leach phthalates or BPA.
Opt for safer alternatives like untreated cedar or redwood, which are naturally rot-resistant. Food-grade plastic, stainless steel, and concrete (sealed to prevent alkaline leaching) are generally safe choices. Always line wooden planters with a safe barrier to prevent soil contact and discourage chewing. Prioritize your pet's curiosity—if they love to nibble, choose the most inert materials available. A thriving garden and a healthy pet can happily coexist with careful material selection.