Root & Vessel 29.75-in L x 8-in W x 5-in H White Plastic Indoor/Outdoor Window Box Liner

Protect and refresh window boxes with the Poly-Pro Flower Box Liner. Designed for use inside compatible flower boxes, this lightweight liner helps create a clean planting area while protecting decorative outer planters from direct soil contact. Its ridged, scalloped side panels add strength and structure, while built-in feet help improve airflow and reduce water pooling underneath. The liner can also be used as a stand-alone flower box on windowsills, porches, decks, or other flat surfaces. Made in the USA from durable, UV-protected plastic, this liner is suitable for indoor or outdoor use. For outdoor use, punch or drill out the drainage holes on the bottom before planting.