Your concern about soil washing away is very valid for urban gardening. Yes, using a lining or filter fabric in planter boxes is highly recommended and serves several crucial purposes. Primarily, a permeable landscape fabric or geotextile liner acts as a barrier at the bottom and sometimes the sides of the box. It allows excess water to drain out freely, preventing root rot, while simultaneously holding the soil in place. This directly addresses soil erosion from watering. Without it, fine soil particles can escape through drainage holes, leading to messy runoff, loss of nutrients, and ultimately, sinking soil levels that harm plant roots. Furthermore, a liner protects the planter material (especially wood) from constant moisture and soil contact, significantly extending its lifespan. For the best results, use a water-permeable fabric over the drainage holes, add a layer of gravel or drainage aggregate, and then place your soil on top. This simple system ensures healthy drainage, retains your valuable soil, and creates a stable environment for your plants to thrive.
I'm worried about soil washing away; do urban planter boxes need a lining or filter fabric?
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