A Framed Lobelia. Like the framed hanging basket idea. Use turquoise or purple Mor Perfect idea for front porch: eye hooks in old frame, hang frame with jute from hook, and center basket filled with favorite shade lovers
Pea gravel and pebbles can weigh down windowboxes. 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.