Plastic Bottles instead of Pea Gravel Pea gravel and pebbles can weigh down window boxes. Empty water bottles are a lightweight option. Place rinsed bottles inside the planter and add soil on top of them. The space between the bottles will allow proper drainage without the extra weight.
create overflowing window boxes and planters inexpensively: After removing the fern from the plastic pot use a serrated kitchen knife and divide them into thirds, just cut straight through the roots. They'll be just fine.