How to Keep Dirt in Stacking Box Planters

Place a coffee filter over the drainage holes in the bottom of each box before you add soil. The coffee filter allows water to drip out of the drainage holes, but keeps the dirt inside.

Keep the soil moist with regular watering. Most container plants need water when the top third of the soil begins to dry out. Try not to allow the top layer of the soil to become crusty and dry. Dry soil is easily eroded by the wind.

Add a 1-inch layer of mulch over the top of the soil. The mulch layer helps to keep the soil moist longer and the top layer of soil in place. Organic mulch adds nutrients to the pot's soil over time. Pebble mulch deters slugs and snails from feeding on your plants. The smaller the individual pieces of mulch, the better. Scatter the mulch over the soil so that it covers it without any significant gaps. Use your finger to scoop the mulch away so that it is not directly touching the base of the plant.