Yes—our planter box factory can manufacture a rectangular planter with a built-in trellis as a coordinated, production-ready product rather than a simple add-on. We can develop the planter and trellis together so the proportions, fixing points, and structural support work as one integrated design. The rectangular planter body can be customized by length, width, depth, and height, while the built-in trellis can be adjusted for overall height, panel width, lattice pattern, vertical spacing, and mounting position. Depending on your target market, we can discuss suitable materials such as wood, metal, composite, or HDPE, along with finishes, colors, and hardware options. For practical outdoor use, we can incorporate drainage holes, a liner or inner pot system, raised feet, and reinforced trellis brackets. Assembly details, flat-pack or pre-assembled packaging, and retail-ready presentation can also be planned according to your project. Our team supports OEM and ODM requests, sample development, structural review, and bulk production with quality checks at key stages. If you have drawings, reference photos, dimensions, or a target price, we can review them and recommend a feasible rectangular trellis planter solution for your market.