20. THE MANY FACES OF METAL PLANTERS

Metal planters have a long history. The Greeks and Romans fashioned copper into planters, and 19th-century European estates used zinc to make troughs and pots. Both materials, with their extraordinary patinated finishes, are still popular today. Copper develops a rich verdigris finish, and zinc, when weathered, features a light gray mottled patina. I especially like zinc planters for their vintage look. They are also lightweight, a plus for balconies and terraces.

An alternative to historic zinc pots are modern steel planters with a galvanized zinc coating. The strength of the steel combines with the weather protection of a zinc coating, which is perfect for larger planters where rigidity is important.

The appeal of contemporary styling has fueled the popularity of metal planters, particularly those made from Corten steel. This type of steel, when exposed to weather, develops a layer of protective rust that has an attractive brown-red patina. The surface rust will never eat through the metal. This is one of Corten’s biggest benefits in the landscape.

The primary drawback to all metal planters is the fact that they are prone to overheating, which can damage plant roots. Manufacturers of metal planters often provide Styrofoam insulation inside the planter to buffer the temperature and ensure that plants stay healthy in both hot and cold climates. Another drawback for metal planters is the potential for excessive rusting in areas with a lot of rainfall or humid subtropic weather. For this reason, manufacturers recommend that metal planters that are prone to rust be kept under a roof or in a sheltered location.

A tall, tapered metal planter crafted from Corten steel sits in a covered entryway. The simple and modern style, combined with the rusted patina, fits a minimalist scheme well.

Here, a wire basket containing pink-and-yellow lantana and purple fan flower (Scaevola) was placed within an antique metal urn. Simply remove the basket from the urn when watering the plants.

A large cast-stone planter lights up a corner. It is filled with white chrysanthemums surrounded by the white strappy leaves of ‘Evergold’ sedge (Carex oshimensis ‘Evergold’) and blue calibrachoa. The white flowers glow at night.

Rich magenta chrysanthemums illustrate the power of one color. Three planters filled with the same flowers make a striking statement.