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extensive container garden for Oprah Winfrey at her Indiana home, as well as the hanging gardens at National Airport in the nation’s capital. Concrete is another good material for its resistance to extreme temperatures.
Plastic pots are also less expensive than most other choices, says Lynn R. Batdorf, horticulturist at the U.S. National Arboretum in Washington, D.C., and they come in virtually every size, including 100 gallons, he says in Arbor Friends, the newsletter for supporters of the National Arboretum. Such large containers can be used to create entire miniature gardens, showcasing a variety of plants.
Clay pots are still the primary choice for many gardeners because the material is porous.
“It lets moisture in and out, which helps roots breathe," says Ernst. They are also less likely to be knocked over or blown over by strong winds. Wood pots are also porous.
“I am inclined to use plastic for small plants and for certain tropicals that require a constant, even supply of moisture,” says Ernst. “1 use clay for most other plants, including the largest ones.”
If you want to use an antique copper kettle or glazed ceramic jardiniere that doesn’t have drainage holes, place a plastic or clay pot inside it for drainage purposes.
Whatever kind of pot you choose, Batdorf recommends raising it up on “feet,” — you can buy wooden bases with caster feet at most garden supply stores — on gravel or wood, to help with drainage as well as air circulation. Some experts also believe that pots set directly on concrete patios, for example, tend to soak up loo much heat from the concrete or other hard surface.
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