Marigolds are a long-time garden favorite due to their bright colors and the ease with which they can be grown. Marigolds are a good choice for areas that are dry and hot; they prefer to grow in full sun.
Marigolds are available in many different forms. Flower color ranges from white to yellow to orange to red. Marigold flower shapes differ, too. Marigolds make a nice border in a garden, a pretty potted plant and a great cut flower.
The USDA's Plant Hardiness Zone map divides the United States into geographic zones according to their winter temperature extremes. Growers rely on the map to ensure their plants can survive year to year. Marigolds are listed as hardy in zones 9 through 11 and can tolerate nighttime temperatures as low as 50 degrees Fahrenheit. In colder regions, marigolds are considered an annual and are killed by frost.
If you live in a colder area and would like to extend the life of your marigolds, try covering them with a sheet or blanket on nights that the temperature will fall below 50 degrees Fahrenheit. This will help to preserve your marigolds for enjoyment into the fall.