Question: Do you know of a vine or climber that I can grow in a container to cover an iron railing on a balcony?
Answer: A quick growing annual would be the morning glories. If you are looking for a perennial vine and have a way to insulate the roots during the winter, you might try a trumpet vine, Campsis radicans.
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When singular and plural spellings differ, as in peony and peonies, try both.