The Maya actually cultivated marigolds long before the French. The ancestors of French marigolds, Tagetes patula, were native to Mexico and Guatemala. French horticulturists merely hybridized the varieties that are now most popular. The largest varieties can grow a foot high and broad. Most, though, stay significantly lower as compact bedding plants.
Contrary to their popularity during autumn, French marigolds are warm season annuals. With frequent deadheading, they can perform from spring until cool winter weather. They are popular as short term annuals merely because they perform best while young. Bloom is slightly less abundant as they age. They can perform as well for spring as for autumn.
Many varieties of French marigolds are available. Yet, their floral color range is limited to yellow, orange and red. Brown flowers are really dark orange. Creamy white flowers are really very pale yellow. White marigolds are uncommon because richer colors are more popular. Like most bedding plants, French marigolds want rich soil and regular watering.
Cool season vegetables will replace warm season vegetables during autumn. Also, cool season annuals will replace warm season annuals. Neither simple task is easy for warm season plants that continue to perform too well to remove. Conversely, some finish early. Autumn annuals may compensate until cool season annuals become more seasonable.
Summers here are long, dry and somewhat warm. Even petunias and other annuals that enjoy warmth and tolerate aridity may not want to perform for so long. Without occasional grooming, they can get shabby by late summer. The recent unusually warm weather only accelerated the process for this year. Summer weather might continue into early autumn.
Consequently, it may still be a bit too early for some favorite cool season annuals that do not appreciate arid warmth. Pansies can get scrawny and lay low in response to warmth. Ornamental cabbage and kale is likely to bolt (general floral stalks) after exposure to too much warmth. Such annuals perform better or for a longer season after summer warmth.
This is why autumn annuals are so popular. They replace tired warm season annuals by the end of summer, and bloom until the weather is cool enough for cool season annuals. Autumn annuals generally bloom for shorter seasons than warm or cool season annuals, but most last until frost or significant rain. After bloom, a few are actually perennial plants.
Chrysanthemums and marigolds may be the most familiar of autumn annuals. Marigolds are actually warm season annuals that can perform just as well during spring or summer. Late installation allows late performance, which can continue until frost or sustained rain. Chrysanthemums are actually perennials, so can grow and bloom again for next autumn.
Celosia and alyssum, like marigold, are warm season annuals that perform late after late installation. Sweet William is a cool season annual that, after early installation, begins to perform earlier. Several types of aster naturally bloom late in summer or early in autumn. Even if nasturtium already succumbed to warmth, fresh seedlings may perform until frost. Old plants, prior to deterioration, could have provided seed, albeit feral, for their own replacement.
Tony Tomeo 