Assemble a rail-mounted planter
This lightweight, durable and attractive deck planter is made from a vinyl gutter, two fascia support brackets and two end caps. It's a snap to make. Glue one of the end caps in place and drill holes in the bottom of the gutter so the water can drain (Photo 1). Slide two fascia support brackets onto the gutter (Photo 2) and glue the other end cap into place. If you want a longer planter, be sure to add extra brackets spaced about every 2 ft.—dirt is heavy.
To prevent the soil from slipping through the drainage holes, line the gutter with newspaper or put shards of old broken clay pots along the bottom.
Shallow planters like these have a tendency to dry out. To cut your watering chore in half, mix water-absorbing polymer gel crystals (available at garden centers) with your potting mix. Or buy bags of soilless potting mix with the polymer crystals already added.
If you want a color other than white, use a spray paint formulated for plastic. Screw the planter to your deck rail (Photo 3), fill it with potting mix and add your plants. Enjoy!