Further detail about this can be seen here. Herein, do window boxes need liners?
Window box liners are essential elements helping to extend the longevity of the window box by preventing direct contact of the container with the organic materials and water used by the plants. Ideally, liners should have holes at the bottom which matches those of the boxes to drain out excess water.
Secondly, what is the best way to line a wooden planter? Line the entire planter with a sheet of plastic, trimming it so that it reaches but does not go over the rim. Staple the plastic all the way around the rim. Using a screwdriver or sharp stick, poke through the drilled drainage holes to let excess water drain out of the plastic liner.
Similarly, it is asked, do I need to line a wooden planter box?
A wooden box may need drainage holes, depending on how porous it is without them. You can also use plastic to line your pots—a preferred method for planters used indoors—but make sure you punch holes through the plastic at the drainage hole locations.
What do you put in the bottom of a window box?
In addition to drilled holes, stones and gravel are essential to proper drainage of windowboxes. Put a two- to three-inch layer of pea gravel or pebbles in the bottom of the planter. This will allow water to filter through the soil and gravel before passing through the drilled holes.
