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Parsnip

life science Maturity 5-7 Next article →

The parsnip, known scientifically as *Pastinaca sativa*, is a root vegetable within the Apiaceae family. This botanical family also includes common plants like carrots and parsley.

Parsnip flowering second year, June 2016
Parsnip flowering second year, June 2016

Parsnips are primarily grown for their large, fleshy, cream-colored taproots. These roots serve as a significant source of nutrition for humans. They contain various vitamins, antioxidants, and minerals, particularly potassium. The roots also provide both soluble and insoluble dietary fiber. Because they are rich in starch, they have historically served as a food source.

Parsnip with honey and mustard
Parsnip with honey and mustard

Parsnips follow a specific biological life cycle known as a biennial cycle. This means the plant requires two years to complete its full life process. In the first growing season, the plant develops an apical meristem. This part produces a rosette of pinnate, mid-green leaves. These leaves often have toothed margins and a somewhat hairy texture. They can grow quite long, with some being stemless and others having short stems. If the plant is left in the ground, it enters its second year. During this time, a tall, woody flowering stem emerges. This stem is hollow except at the nodes and can grow to more than 1 meter tall.

The reproductive stage of the parsnip involves a specific flower structure called an umbel. This is a loose, compound arrangement of small yellow flowers. Each umbel consists of six to 25 straight pedicels, which are small stalks. These stalks support smaller clusters known as umbellets. The flowers themselves are quite small, featuring five yellow petals that curl inward. They also contain five stamens and one pistil. After pollination, the plant produces fruits called schizocarps. These fruits are oval, flat, and light brown in color. They possess narrow wings and short, spreading styles to assist in dispersal.

Pastinaca sativa MHNT.BOT.2004.0
Pastinaca sativa MHNT.BOT.2004.0

Human history with the parsnip is very deep and spans many centuries. The plant is native to Eurasia and has been used since antiquity. Roman cultivators grew parsnips, though ancient literature sometimes confuses them with carrots. In fact, the Latin term *pastinaca* was used for both vegetables. Before cane sugar became widely available in Europe, parsnips were used as a sweetener. European settlers eventually introduced the plant to the Americas. However, by the mid-19th century, the potato replaced the parsnip as a primary starch source. This shift caused parsnip cultivation to decrease for a period of time.

Significant advancements in parsnip breeding occurred in the 19th century. In 1859, James Buckman developed a new cultivar named 'Student' in England. He worked at the Royal Agricultural College using a method called selective breeding. Buckman back-crossed cultivated plants with wild stock to improve the crop. This experiment was highly successful and made 'Student' a major variety. Today, different shapes of parsnips exist depending on the cultivar. Many are narrowly conical, but some are more bulbous. Food processors often prefer the bulbous varieties because they are more resistant to breakage.

While useful as food, wild parsnip can pose serious health risks. All parts of the plant contain chemical compounds called furanocoumarins. These chemicals can sensitize mammalian tissue to sunlight. If the plant touches your skin and you are exposed to the sun, it can cause photodermatitis. This condition results in skin rashes or even painful blisters. Contact with the eyes is even more severe and can potentially cause blindness. In North America, wild parsnip can become invasive. It forms dense stands in abandoned yards and roadsides, outcompeting native plant species.

Cultivating parsnips requires specific environmental conditions to be successful. They grow best in deep, sandy, or loamy soil that is free of stones. Stony or heavy clay ground often results in short, forked roots. Farmers often plant seeds in early spring when the ground is fine. A unique chemical change occurs when the plant experiences its first frost. Low temperatures cause the starches in the root to convert into sugars. This process makes the parsnip taste much sweeter.

Parsnip flowering second year, June 2016
Parsnip flowering second year, June 2016

Farmers must also protect the crop from various biological threats. Insects like the carrot fly can burrow into the roots, creating entry points for disease. The parsnip moth can also damage the flowers and seeds by building webs on the umbels. Fungal diseases are another major concern for growers. Parsnip canker can cause black or orange-brown patches on the root crown. Other fungi can cause watery soft rot or violet root rot. Additionally, several viruses, such as the parsnip yellow fleck virus, can infect the plant and cause yellowing of the leaves.

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🖼️ Images & Media (5)
File:Pastinaca sativa MHNT.BOT.2004.0.jpg
Pastinaca sativa MHNT.BOT.2004.0.jpg
File:Parsnip_flowering_second_year,_June_2016.jpg
Parsnip_flowering_second_year,_June_2016.jpg
File:Pastinaca sativa Sturm28.jpg
Pastinaca sativa Sturm28.jpg
File:PastinacaSativa Mosbo6.jpg
PastinacaSativa Mosbo6.jpg
File:Parsnip with honey and mustard.JPG
Parsnip with honey and mustard.JPG
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