planter box inserts plastic Square Planter Box Liner Bag

Square Planter Box Liner Bag, 16-Inch Corner Fit, Single
✔️ Single unit liner fits 18x18 in square planters (500 mm)

Fits inside square planter boxes up to 18x18 in (500 mm) and works with wood, concrete, plastic, resin, composite, and metal designs. The flexible material presses neatly into corners for a clean, custom fit. Color: Black.

✅ Fits square planter boxes up to 18 in x 18 in (500 mm) corner-fit
✅ Plant-safe, horticulture-friendly materials, recyclable
✅ Helps retain soil moisture while reducing direct soil contact with walls
✅ Quick, clean installation: press into corners and trim to height
✅ UV-resistant, NZ-made for outdoor durability; not for ponds

💡 What is a square planter liner bag used for and how does it work?

In short, liners protect planter interiors, help manage moisture, and keep soil off planter walls.

- Protects interior surfaces and reduces mess
- Improves moisture retention for healthier plants
- Easy to trim to height for a snug fit
- Made from plant-safe, recyclable materials for outdoor use