When painting outdoor plant boxes used for growing food, safety is paramount. The safest paints are those labeled as "food-safe" or "non-toxic," specifically designed for contact with edible plants. Acrylic-based paints, especially those certified by the FDA or other regulatory bodies, are a popular choice due to their low toxicity and durability. Avoid paints containing heavy metals, VOCs, or harmful chemicals that could leach into the soil and affect plant health. Opt for water-based, plant-friendly paints that resist weathering while ensuring your herbs, vegetables, and fruits remain safe for consumption. Always check labels for certifications like "AP Certified Non-Toxic" to guarantee suitability for food gardens.