Gardeners often plant geraniums because of their easy care and long blooming season. Geraniums bloom from late spring to frost, producing the best flowers when planted in a sunny location in May.
The common geranium, from the Pelargonium genus, grows as an annual throughout the United States and most of the world. It flourishes as a perennial only in tropical regions.
These flowers grow in temperate zones, offering a much higher cold tolerance than the common geranium.
Most geraniums grown in the garden are of the common type, according to Texas A&M University. These grow well in pots or flower beds as annuals, noted for their bold colors and thick, green foliage.