You may be drawn to the look of certain planters, but you’ll also want to take your environment into account. For instance, Grade A Teak is naturally weather-resistant, but will turn to a silvery patina if left to the elements, which many people prefer. And some materials, like Corten steel, are designed to weather after a few months, which provides a rustic look and means you won’t have to paint your planter to keep it looking nice.