As for any deck railing planters, all railing, handrails on lower supports, must be sturdy and strong enough to support a plant, potting soil, and in this case, a chunky wooden planter. Designing planter to form an almost regular rectangular box with slightly wider than bottom edge handrail. However, to allow planter feels safe, make their longer vertical sides extend down several centimeters below top of railing, to “anchor” in position, lowering center of gravity.
A hanging pot not straddles rail, but it hangs just inside or outside, with support of a robust support that hooks on top of deck railing planters. If you have a wrought iron railing or other narrow materials, opt for a hanging pot rather than one that sits atop railing. As for any type of rail planter, hanging deck railing planters exert a force on rail, this time pulling slightly to one side; make sure railing structure can withstand load. With a hanging pot, you can use any robust planter select hardware support is adapted. Lightweight plastic planters less force exerted on rail and are more weather-resistant than untreated wood. If you do opt for a wooden container, cedar is well in outdoor applications, naturally resist rot.