What began as a small manufacturing business two decades ago has grown into an industry leader in landscape products. Planterworx was founded by Randy Rollner, who studied at Parsons before beginning his career in architectural metal in 1997. â€œItâ€™s all in the details,â€ says Rollner, and the designers on his team are true artisans and craftsmen who bring the precise, balanced lines normally found in modern architecture to these metal Planters (2011). The Planterworx designers insist on using a high percentage of recycled content and recyclable materials. The powder-coated charcoal Planters are finished with an eco-friendly process that contains no V.O.C.s, and the overspray is 100% recoupable. The CortenÂ® Steel Planters are made of the same material designed for bridges and skyscrapers, which has a reactive patina period of three to nine months, depending on location and climate. This patina or rust acts as a protective barrier and does not compromise the structural integrity of the material. After the initial reactive period, Corten Steel will cure and self-seal with very little runoff. Equipped with drainage holes. The Corten Steel Planters do not come pre-weathered. Made in U.S.A. Charcoal Planters: There is no patina period for these powder-coated planters. They come fully finished in a charcoal color and will not stain adjacent materials. Corten Steel Randy Rollner: Planterworx Arena Rectangular Planters.