At our planter box factory, the price difference between cedar and plastic planters for the same size is not one fixed number, because both materials can be made in different grades. For a standard planter with identical outside dimensions, plastic is normally the lower-cost option. A basic plastic planter may be the most economical choice, while a cedar planter of the same size often costs more because cedar requires natural wood selection, cutting, sanding, joinery, and finishing. In typical factory quotes, cedar can be about 30% to 150% more expensive than comparable plastic; if the cedar planter is thick-walled, furniture-grade, or fully customized, it can be two to four times the price of a thin, mass-produced plastic planter. The gap shrinks when the plastic planter uses thick UV-stabilized walls, commercial-grade resin, custom colors, or reinforced structure, and it grows when cedar includes premium clear boards, stainless hardware, liners, stain, or custom dimensions. Plastic is cheaper mainly because injection molding and extrusion spread tooling costs over high volumes and use lower-cost raw material. Cedar costs more because it is naturally rot-resistant, insect-resistant, better for root insulation, repairable, refinishable, and far more attractive in natural garden settings. For an exact same-size quote from our planter box factory, send the dimensions, wall thickness, style, drainage, finish, and order quantity. We will compare cedar and plastic side by side. Usually, plastic will be the budget-friendly choice and cedar will be the premium long-term choice, with the final price difference based on durability, appearance, and customization.