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Tagetes

life science Maturity 5-7 Next article →

The genus *Tagetes* includes about 50 species of plants. Most are annuals, which means they live for one growing season. Others are perennials, meaning they live for many years. These plants belong to the Asteraceae family. In English, most people call them marigolds. They are native to Central and Southern Mexico and several Latin American countries. Some species have moved to other parts of the world. One specific species, *Tagetes minuta*, is considered a noxious invasive plant in certain areas.

Urbana Illinois park 20070928 img 2120-crop
Urbana Illinois park 20070928 img 2120-crop

These plants vary significantly in their physical size. They can grow as short as 0.1 meters. Some species can reach a height of 2.2 meters. Most have green leaves that are pinnate, which means they are divided into smaller leaflets. The flower heads usually measure between 4 and 6 centimeters in diameter. These blooms come in colors like gold, orange, yellow, and white. Many flowers also show maroon highlights. The flower heads typically contain both ray florets and disc florets.

Urbana Illinois park 20070928 img 2120-crop
Urbana Illinois park 20070928 img 2120-crop

Marigolds use a fibrous root system to grow. This type of root consists of many thin, thread-like strands. These roots exude substances called thiophenes. These chemicals have antibacterial properties. Because of these thiophenes, you should not plant marigolds near legume crops. Most species grow well in many types of soil. Many horticultural varieties prefer soil with good drainage. Some cultivars are also very tolerant of drought, which is a long period without rain.

History and naming provide interesting connections to the past. Carl Linnaeus described the genus *Tagetes* in 1753. The name *Tagetes* likely comes from the Etruscan god Tages. In mythology, Tages was born from plowing the earth. This name may refer to how easily these plants return each year. They can grow from seeds or from stems that regrow from a stump. The English name, marigold, comes from "Mary's gold." This name honors the Virgin Mary. It was originally applied to a different European plant called *Calendula officinalis*.

There are several distinct types of cultivated marigolds. African marigolds usually refer to hybrids of *Tagetes erecta*. French marigolds usually refer to hybrids of *Tagetes patula*. Many of those were developed in France. Signet marigolds are hybrids derived mostly from *Tagetes tenuifolia*. These different varieties are used for many specific purposes. Some are grown for their beauty, while others are used for food or medicine.

Sepulcro adornado
Sepulcro adornado

Marigolds have many important uses in industry and nature. The florets of *Tagetes erecta* are rich in a carotenoid called lutein. This is an orange-yellow pigment. In the European Union, lutein is used as a food colorant (INS number E161b). It colors foods like pasta, margarine, mayonnaise, and ice cream. In the United States, these extracts are approved for use in animal feed. In nature, marigolds support many animals. They are food for caterpillars like the dot moth. They also provide nectar for butterflies and bumblebees.

'Gonepteryx rhamni' 2 male
'Gonepteryx rhamni' 2 male

Cultural significance varies widely across the globe. In Mexico, *Tagetes erecta* is used for Day of the Dead celebrations.

Sepulcro adornado
Sepulcro adornado

In India and Bangladesh, they are used for weddings and festivals like the turmeric ceremony. They are even sold in markets for daily rituals. In Ukraine, varieties like *T. erecta* and *T. patula* are national symbols. They appear in local songs and poems. In South America, *Tagetes minuta* is used as a culinary herb called huacatay. It is used to make a potato dish called ocopa. Other species, like *Tagetes lucida*, are used to make medicinal teas.

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File:'Gonepteryx rhamni' 2 male.JPG
'Gonepteryx rhamni' 2 male.JPG
File:Sepulcro adornado.jpg
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