The short answer is that it depends on the exact planter box model and the terms of your factory quotation. If the factory uses a liner in production, that does not automatically mean the liner is included in the delivered unit price. In many standard orders, a fitted liner is included when the product specification, quotation, or order confirmation lists it as part of the package. However, some factories offer the liner as an optional accessory or quote it as a separate line item, especially when a customer requests a special drainage configuration.

For drainage, do not only ask whether a liner is included. Ask whether the liner is drainage-ready. A useful liner for planter boxes should have pre-drilled drainage holes, perforations, or a design that allows excess water to escape. If the liner is watertight and has no drainage points, it may hold water against the soil and reduce root health unless the planter box also has a separate drainage layer or the factory drills holes during production.

Before you order, confirm these points in writing: Is the liner included in the unit price? Does the liner have drainage holes? Is it removable for cleaning? Are drainage holes already drilled in the planter box itself? Is a gravel layer, root barrier, or overflow system included? If the liner is not included, you can buy it separately, but a factory-supplied liner is usually easier to fit and may be covered by the same specification and warranty. The safest approach is to request a line-item quote that clearly states whether the liner and drainage features are included or sold separately.