Keep your square planters looking great and your plants thriving with OAKENZ Square Planter Liners. Designed to fit securely inside wooden, metal, plastic, or concrete planters, these durable liners protect your planter and promote healthier growth. Available in Medium, Large and and Xtra Large, each liner is crafted from UV-resistant, recyclable material built to withstand the elements. By preventing leaks, rot, and corrosion, OAKENZ liners extend the life of both your planter and the surfaces around it. Measure the inside of your planter (length × width × depth) and match to the size below. If your planter is between sizes, choose the next size up. Size Fits planter (inches) Fits planter (cm) Available as Medium 16" × 16" × 16"H 400 × 400 × 400mm H Single & 2-Pack Large 20" × 20" × 18"H 500 × 500 × 450mm H Single & 2-Pack XL 24" × 24" × 20"H 600 × 600 × 500mm H Single & 2-Pack Not sure? Measure the inside of your planter. If your planter is close to the maximum dimensions, choose the next size up. Heights can be trimmed if liner is too tall. Protects Your Planters → Stops soil and moisture from damaging wood, rusting metal, or wearing concrete and plastic. Preserves Surfaces → Prevents messy leaks and staining on decks, tiles, patios, and concrete. Promotes Healthy Plants → Retains moisture for better hydration and root growth. Sized to Fit → Available in 3 sizes to suit the most common square planter boxes. Built to Last Outdoors → Made from UV-resistant, durable plastic. Eco-Friendly → Crafted from recyclable materials. Proudly NZ Made → Designed with quality and sustainability in mind. Perfect For Wooden, metal, plastic, and concrete square planters. Gardeners who want longer-lasting planters and healthier plants. Protecting outdoor surfaces from water stains and soil mess. Choose the size that fits your planter and enjoy a cleaner, healthier, and longer-lasting garden with OAKENZ Square Planter Liners Questions and answers What size liner do I need for a 16x16, 20x20 or 24x24 planter box? Medium fits planters up to 16 x 16 x 16 inches. Large fits up to 20 x 20 x 18 inches. XL fits up to 24 x 24 x 20 inches. Measure the inside of your planter; if it is close to the maximum, choose the next size up and trim the height. Does the liner have drainage holes? No. Holes are not pre-cut, so you can cut them to line up with the drainage holes in your planter. A liner with no drainage will hold water around the roots. Is the liner waterproof? It is a waterproof barrier between wet potting mix and the planter walls. It is not designed as a pond liner or to hold standing water. How is this different from lining a planter with pond liner or plastic sheet? It is a bag made to the size of the planter, so there is no measuring, cutting to shape or stapling. Place it inside, press it into the corners and fill. Can I use it in a rectangular planter? No. It is made for square planters in the three sizes listed. How do I fit it? Place the liner in the planter and press it loosely into the corners. Fold or trim any extra height. Cut drainage holes to match the planter's, then fill with potting mix. Raise the planter on Corner Planter Feet to let it drain and dry underneath.