The Fascinating Venus Flytrap: A Carnivorous Plant in Trouble

The Venus flytrap is an intriguing plant that is in trouble in the wild. Like other plants, it has chloroplasts and makes food via photosynthesis. It also traps and digests insects to supplement the low concentration of nitrogen in its boggy habitat. The plant's ability to lure its prey into its trap and the rapid closure of the trap doors are fascinating for many people. The appearance of the empty husk of an insect when the trap opens up is impressive evidence of the plant's digestive power.

Wild Venus flytraps are found only in North Carolina and South Carolina in the United States. The population is classified as vulnerable by the IUCN (although the organization says that a status update is needed) and is facing some serious stresses.

In October 2016, botanists from the University of Wisconsin-Madison announced that they had filed an emergency petition with the U.S. Fish and Wildlife Service. The petition asked for the Venus flytrap to be classified as endangered. It was accepted in late 2017 and is still active. Unfortunately, the government appears to be moving slowly with respect to the petition. As of late 2019, the plant hasn't yet been added to the federal government's Endangered Species List.

The leaves of the Venus flytrap are highly specialized. They grow in a rosette that is produced by an underground stem known as a rhizome. The first section of each leaf is flattened, as shown in the first photo in this article. It has a narrow base and gradually widens towards its tip. At the widest point of this section is a short stalk that attaches the trap to the rest of the leaf.

The trap consists of two lobes with a hinge between them. The hinge allows the lobes to come together as the trap closes. The edges of the lobes have long spikes that keep the prey captive. The trap is green on the outside and deep red, pale red, or green on the inside. The overall effect is reminiscent of an animal's jaw and teeth.

The flowers of the Venus flytrap have a green centre and white petals decorated with green lines. They are pollinated by insects. The flowers are borne on tall stalks that extend far beyond the leaves. This may prevent pollinating insects from being trapped by the plant.

The fruit is a green pod that is roughly rounded in shape instead of being shaped like a pea pod. The pod opens to reveal shiny black seeds. Each seed is rounded at one end and pointed at the other.

The trap secretes a sweet nectar that attracts prey. The prey animal is generally an insect but may be a spider. There are four trigger hairs on the interior surface of each lobe. The trap doesn't close the first time that a trigger hair is stimulated by the prey. If there is another hair stimulation within about twenty seconds, however, the trap is sprung. It sometimes closes in as little as a tenth of a second.

The trap doesn't close completely at first, which allows smaller prey to escape. This behaviour may have developed because it prevented the plant from digesting prey that supplied little nutrition. The trap soon becomes an impenetrable chamber, sealing the fate of its victim.

In contrast to the rapid capture of the prey, digestion is a lengthy process that takes about five to ten days. The products of digestion are absorbed and used. The plant is unable to digest the tough outer layer of an insect, which is known as an exoskeleton. When the trap opens, the exoskeleton is blown away by wind or washed away by rain. The trap is then ready to capture prey again. After three or four captures, the trap (but not the plant) dies.

Unlike humans, the Venus flytrap doesn't have nerves to transmit electrical signals or a brain to respond to them. Nevertheless, electrical signals are generated in a stimulated trap and travel along the surface of cells. In addition, the plant responds appropriately to the signals, even though it doesn't have muscles.

The full details of trap action are unknown, but some interesting facts have been discovered. According to a research team led by Dr. Ranier Hedrich at the University of Würzburg, one touch to the trigger hairs elicits no response. This is advantageous for the plant, since it reduces the chance that it will respond to debris or water drops that land on the open trap. A second touch within fifteen to twenty seconds creates an electrical impulse known as an action potential. This impulse causes a large amount of water to enter the cells in the trap, which changes their shape. As a result, the trap closes.

After a trap has closed, the plant continues to "count" and respond to trigger hair stimulation. A third touch to the hairs causes the trap to produce a hormone called jasmonic acid. The hormone triggers the digestive glands in the trap to make enzymes. Subsequent touches to the hairs cause digestive enzymes to be released from the glands. The enzymes break down the tissues of the prey, providing nutrition for the plant.

Jasmonic acid is also found in many plants that aren't carnivorous. Here it stimulates the production of enzymes that destroy insect pests. It's interesting that the hormone serves related functions in different types of plants.

In the wild, the Venus flytrap is found only in the southeastern part of North Carolina and the northeastern part of South Carolina. Its population is decreasing due to development and poaching. The bogs where the plants grow are being drained and covered to create land for humans. Another problem is that some people collect large numbers of plants to sell.

The species is unlikely to become extinct in the near future due to its cultivated population. Researchers say that they are currently more plants in homes and gardens than in the wild. There are drawbacks to the existence of a species only in captivity, however.

It's sad when the biodiversity of the planet is decreased. There may be practical problems with loss of biodiversity as well as emotional ones. If a plant exists only in a cultivated form, its natural evolution is disturbed and is replaced by selective breeding by humans. Scientists are discovering that plants in nature often have beneficial characteristics for humans. The potential benefits of a plant may be lost in captivity.

A Venus flytrap is a fascinating plant for people to have in a home, especially for children. It's important to buy a flytrap from a reputable nursery that sells only cultivated plants. This will help to protect the wild population. Another advantage is that the nursery staff will probably be able to offer advice about keeping the plant alive and healthy.

The plant is a perennial and requires moist, acidic, and low-nutrient soil that mimics the substrate found in its natural habitat. It also requires a periodic meal of a live insect. Distilled water or rainwater should be used to moisturize the soil. Tap water contains too many minerals and will likely be too alkaline. The soil shouldn't become waterlogged. The plant does best in direct or at least bright sunlight but mustn't be allowed to overheat.

Venus flytraps enter dormancy in winter. Some of their leaves may turn black and the plants may even appear to be dead at this time. They regenerate in the next growing season, however. The plants should spend their dormancy in a cool environment that has approximately the same temperature as that found in winter in their natural habitat. They shouldn't be allowed to freeze, though. In addition, the soil in their container shouldn't become dry.

Special steps may be needed to care for the plants in some environments. Anyone who would like to buy a cultivated Venus flytrap should investigate the best way to care for it where they live before bringing it into their home or garden.

Flytraps take a long time to grow from seeds, so cultivated plants are usually produced by other methods. Division of a plant at suitable times of the year is sometimes used to produce new individuals. The plants are also generated by a process known as tissue culture. This involves the stimulation of a small piece of plant tissue in a lab. The tissue is supplied with nutrients and treated with hormones that stimulate root and shoot growth.

Cultivated plants are interesting and often enhance our lives. Wild populations are also important, however. As the scientist in the quote above says, snap traps (or snaptraps) have evolved only once on Earth. The Venus flytrap is a unique plant. It would be a great shame to lose it from the wild.

• How the Venus flytrap got its taste for meat from sciencemag.org
• Genome research from the EurekAlert news service
• The problem of poaching wild Venus flytraps from the New York Times
• Dionaea muscipula status from the IUCN or International Union for Conservation of Nature (The plant's population status was last assessed in 2000. Some of the IUCN data needs to be updated)
• Botanist leads petition to give the Venus flytrap endangered species protection from the University of Wisconsin-Madison
• Dionaea muscipula could get federal protection from the Coastal Review Online
• Plants in peril from Mental Floss
• Venus flytraps don’t eat the insects that pollinate them from North Carolina State University
• How to grow the plants from Better Homes and Gardens
• Carnivorous plant care from the Royal Horticultural Society