No annual is more cheerful or easier to grow than marigolds. These flowers are the spendthrifts among annuals, bringing a wealth of gold, copper, and brass into our summer and autumn gardens. The flower’s popularity probably derives in part from its ability to bloom brightly all summer long.
Marigolds may have daisy-like or carnation-like flowerheads that are produced singly or in clusters. Although there are some 50 species, most marigolds we know come from just three:
Tagetes erecta are the tallest and most upright, at three to five feet. They are sometimes known as African, or American, marigolds. They thrive under hot, dry conditions.
Bushy T. patula, or French marigolds, are somewhat smaller and more compact. They are often wider than they are tall. Elegant and eye-catching, they have relatively demure flowers and usually grow from 6 inches to 2 feet tall.
The dainty T. tenuifolia are the signet, or rock-garden, marigolds that like hot, dry sites and make a wonderful edging. Their flowers are edible.