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Carob

life science Maturity 9-11 Next article →

The carob tree, known scientifically as Ceratonia siliqua, is a remarkable evergreen shrub or tree.

Carob tree
Carob tree

It belongs to the Fabaceae family, which is the legume family. This tree is native to the Mediterranean region and the Middle East. It is highly valued for its edible fruit and its use in landscaping. The carob is a xerophyte, meaning it is a plant specially adapted to survive in dry environments.

Carob tree leaf
Carob tree leaf

This adaptation allows it to thrive in warm, subtropical areas with very little rainfall.

The physical structure of the carob tree is quite distinct. It features a thick trunk covered in rough brown bark and supports a broad, semispherical crown. Its leaves are pinnate, meaning they consist of several leaflets arranged along a stem. The tree is often dioecious, which means individual trees are either male or female. Because of this, only the female trees produce the fruit we eat. Some trees are hermaphroditic, meaning they possess both male and female parts.

Illustration Ceratonia siliqua0
Illustration Ceratonia siliqua0

Producing fruit is a long and complex biological process for the carob. The flowers appear in autumn, arranged in small, numerous clusters called racemes. These flowers are pollinated by both the wind and various insects. Interestingly, the male flowers produce a distinct odor caused by amines. Once pollinated, the fruit begins to grow as a legume, often called a pod. These pods can be straight, curved, or compressed in shape. It takes a full year for a pod to develop and reach maturity.

Arcosu07
Arcosu07

Once the pods ripen and fall, they play a role in the tree's ecology. Various mammals, such as swine, eat the sweet, ripe pods. The seeds inside are very hard and pass through the animal's digestive system. This process helps disperse the seeds in the animal's excrement to new locations. The seeds themselves contain a colorless substance called leucodelphinidin. This is a precursor to other chemical compounds used in plant biology.

Humans have harvested carob for centuries, using it in many different ways. The fruit pod consists of two main parts: the pulp and the seeds. The pulp makes up about 90% of the total weight of the pod. It is often ground into a powder or small chips to replace chocolate in recipes. The seeds, which make up the remaining 10%, are used to create locust bean gum. This is a common thickening agent used throughout the food processing industry.

Garroves
Garroves

The history of the carob is reflected in its many names and measurements. The word "carob" comes from Middle French, which borrowed from Arabic and Persian. In English, it is sometimes called "St. John's bread." The name of the seed even influenced how we measure precious items. The carat, a unit used for gemstones and gold purity, comes from the Greek name for the carob seed. This connection shows how deeply the carob has been integrated into human culture and commerce.

A bottle of Maltese carob liqueur with the north coast of Gozo Island in the background (Malta, April 2009)
A bottle of Maltese carob liqueur with the north coast of Gozo Island in the background (Malta, April 2009)

Modern carob production is a significant global industry. In 2022, world production of locust beans was estimated at 56,423 tonnes. Spain is currently the largest producer, followed by Italy and Morocco. Most of the reported global total comes from Turkey and Morocco. Growing these trees requires patience, as they enter the production phase slowly. In marginal soils, it can take up to 8 years to bear fruit. Full, stable yields usually do not occur until the tree is 20 to 25 years old.

Cultivating carob involves specific management to ensure a healthy harvest. Farmers often use grafting or air-layering to help the trees reproduce. Harvesting is a delicate, labor-intensive task often done by knocking pods down with long sticks. After the harvest, the pods must be dried until they have only 8% moisture. This prevents the fruit from rotting during storage. While the tree is hardy, farmers must watch for pests like the carob moth. This moth can cause significant damage to crops both before and after the harvest.

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🖼️ Images & Media (6)
File:Carob tree leaf.JPG
Carob tree leaf.JPG
File:Illustration Ceratonia siliqua0.jpg
Illustration Ceratonia siliqua0.jpg
File:Arcosu07.jpg
Arcosu07.jpg
File:Garroves.JPG
Garroves.JPG
File:A bottle of Maltese carob liqueur with the north coast of Gozo Island in the background (Malta, April 2009).jpg
A bottle of Maltese carob liqueur with...
File:Carob tree.jpg
Carob tree.jpg
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