Live to Plant

How Much Oxygen Does Fennel Plant Produce?

Updated: April 24, 2022

Fennel is a flowering plant species belonging to the carrot family. It is native to the Mediterranean region but is now widely cultivated in other parts of the world. The fennel plant is known for its aromatic and flavorful seeds, which are used as a spice in cooking. However, fennel also plays an essential role in producing oxygen and purifying the air we breathe.

How Does Fennel Produce Oxygen?

Like all plants, fennel produces oxygen through a process called photosynthesis. During photosynthesis, plants absorb carbon dioxide from the air and water from the soil. Using energy from the sun, they transform these elements into glucose and oxygen. The glucose is used to fuel various metabolic processes within the plant, while the oxygen is released into the atmosphere.

Fennel, like other plants, produces oxygen during the day when there is ample sunlight available for photosynthesis. At night, however, plants undergo a process called respiration, where they take in oxygen and release carbon dioxide. This means that fennel and other plants do not produce oxygen at night and instead consume it as part of their metabolic processes.

How Much Oxygen Does Fennel Plant Produce?

The amount of oxygen produced by a fennel plant varies depending on several factors, including its size, age, and growth conditions. Generally speaking, larger and more mature fennel plants produce more oxygen than younger ones.

Studies have shown that a single mature fennel plant can produce up to 4.5 liters of oxygen per day. This may not seem like much compared to the 550 liters of oxygen an average human consumes every day, but it is still a significant contribution to our atmosphere’s oxygen levels.

It’s worth noting that while fennel does produce oxygen during the day, it also consumes it at night during respiration. As such, the net amount of oxygen produced by fennel and other plants over a 24-hour period is relatively small but still essential to maintaining the delicate balance of gases in our atmosphere.

Benefits of Fennel Plant for Air Quality

Apart from producing oxygen, fennel can also help purify the air we breathe. Like other plants, fennel absorbs pollutants such as carbon monoxide, benzene, and formaldehyde from the air through tiny pores on its leaves. These toxins are then broken down and transformed into harmless compounds within the plant.

Research has shown that indoor plants such as fennel can significantly improve indoor air quality by reducing levels of harmful pollutants. This makes them an excellent addition to homes, offices, and other indoor spaces where air quality may be a concern.


In conclusion, fennel is an essential plant species that not only adds flavor to our meals but also plays a crucial role in producing oxygen and purifying the air we breathe. While a single fennel plant may not produce much oxygen compared to our daily needs, collectively, plants like fennel play a vital role in maintaining our atmosphere’s oxygen levels.


Can fennel plants grow indoors?

Yes, fennel plants can grow indoors as long as they have access to ample sunlight and well-draining soil.

Can I eat the leaves of the fennel plant?

Yes, the leaves of the fennel plant can be used in cooking and have a mild licorice flavor.

Is fennel safe for pets?

While fennel is generally safe for pets to consume in small amounts, consuming large quantities may cause digestive upset. It is best to consult with a veterinarian before giving your pets any new foods or plants.