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Collard (plant)

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Collard is a group of loose-leafed plant cultivars belonging to the species Brassica oleracea. This same species includes other common vegetables like cabbage and broccoli. Collards are classified as part of the Acephala Group, which is often called the kale group. The name Acephala comes from a Greek word meaning "without a head." This refers to the plant's lack of a close-knit core of leaves. Unlike cabbage, which forms a tight head, collards have an open structure.

Collard Plants
Collard Plants

This specific growth habit makes them more tolerant of high humidity. It also makes them less susceptible to various fungal diseases.

The physical structure of the plant varies depending on the specific cultivar. Most collards grow on an upright stalk that reaches over two feet in height. Some Portuguese cultivars are even larger, reaching up to six feet tall. They are considered biennial plants, meaning they complete their life cycle in two years when winter frost occurs. However, some varieties may behave as perennials in warmer regions.

Collard green field in North Centre Township, Columbia County, Pennsylvania
Collard green field in North Centre Township, Columbia County, Pennsylvania

For the best texture, farmers often pick the leaves before they reach their maximum size. At this earlier stage, the leaves are thicker and require different cooking methods than older leaves.

Cultivating collards involves managing several environmental factors and biological threats. The plants are commercially grown for their thick, slightly bitter, edible leaves. These leaves are available for consumption year-round. However, they are often tastier and more nutritious after the first frost of the season. Growers must also protect the plants from various soil-dwelling pests known as nematodes. These are microscopic worms that can cause significant damage to the crop.

Collard greens on a stovetop
Collard greens on a stovetop

For example, the sting nematode (Belonolaimus gracilis) and the awl nematode (Dolichodorus spp.) act as ectoparasites that injure the plant. These pests can cause stunted growth, wilting, and chlorosis, which is the yellowing of plant tissue.

Nematodes present several different challenges to a healthy collard crop. The sting worm species Belonolaimus longicaudatus is particularly devastating to seedlings and transplants in Georgia and North Carolina. In sandy soils, as few as three nematodes per unit of soil can cause significant yield losses. Other species, like the stubby root nematodes (Trichodorus and Paratrichodorus), feed near the tips of the plant's taproots. This feeding prevents proper root elongation and creates tight, swollen mats of roots. Additionally, root knot nematodes (Meloidogyne spp.) can cause deformations called galls. These galls prevent the plant from taking up necessary water and nutrients, leading to wilting and stunting.

Collards provide significant nutritional value to the human diet. Raw collard greens consist of 90% water, 6% carbohydrates, and 3% protein, with negligible fat content. They are an exceptional source of vitamin K, providing 339% of the Daily Value (DV) in a single serving. They are also considered rich sources of vitamin A, vitamin C, and manganese, providing 20% or more of the DV. Furthermore, they serve as moderate sources of calcium and vitamin B6.

Caldo verde
Caldo verde

Because of this density of nutrients, they have been a staple in many global diets for centuries.

Historically, the use of collards has deep roots in many different cultures. In Europe, references to these plants exist in Greek and Roman history dating back to the 1st century CE. In the United States, collards are a vital symbol of Southern and African-American culture. During the era of slavery, they were common in kitchen gardens because they could withstand both summer heat and winter cold. In the Appalachian region, people often grow cabbage collards, which have yellow-green leaves and a partial heading structure. This differs from the dark-green, non-heading types found in the coastal South. Even today, various festivals and museums celebrate the cultural importance of the plant.

Culinary traditions for collards are diverse and reflect local ingredients. In East Africa, they are known as sukuma wiki and are often sautéed with onions and salt. In the Kashmir Valley, the plant is called haakh and is frequently served as a simple soup with rice. Portuguese and Brazilian cuisines utilize cultivars like couve manteiga or couve tronchuda. These are often used in the popular Portuguese soup called caldo verde, or "green broth."

Caldo verde
Caldo verde

In the Southern United States, collards are traditionally eaten on New Year's Day alongside black-eyed peas and cornbread to symbolize wealth for the coming year.

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🖼️ Images & Media (4)
File:Collard Plants.jpg
Collard Plants.jpg
File:Collard green field in North Centre Township, Columbia County, Pennsylvania.JPG
Collard green field in North Centre...
File:Collard greens on a stovetop.jpg
Collard greens on a stovetop.jpg
File:Caldo verde.jpg
Caldo verde.jpg
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