Carob
Ceratonia siliqua
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The Carob (Ceratonia siliqua) is an ancient Mediterranean tree whose sweet, nutritious pods have sustained human civilizations for over 5,000 years. Often called "St. John's Bread" or "Locust Bean," its dark brown pods are used as a chocolate substitute, a natural sweetener, and the source of locust bean gum — one of the most important natural food thickeners in the modern food industry.
• The genus name Ceratonia derives from the Greek "keration" (little horn), describing the pod shape — this is also the origin of the word "carat," as carob seeds were historically used as standard weights for measuring gold and gemstones
• The species epithet "siliqua" is Latin for "pod" or "husk"
• Known as "St. John's Bread" from the Biblical reference to John the Baptist eating "locusts and wild honey" — the "locusts" may have been carob pods
• The word "carat" derives directly from "keration," the Greek name for carob seeds, which were remarkably uniform in weight (~0.2 grams)
• Carob powder is used as a caffeine-free, theobromine-free chocolate substitute
• Locust bean gum (LBG) from carob seeds is one of the most widely used natural food additives in the world
Taxonomy
Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Fabales
Family
Fabaceae
Genus
Ceratonia
Species
Ceratonia siliqua
Ceratonia siliqua is native to the eastern Mediterranean region, with origins in the Levant and southern Anatolia.
• Native to the Mediterranean basin — found wild in southern Turkey, Syria, Lebanon, Israel, Palestine, and Cyprus
• Also native to parts of Greece, southern Italy, Spain, Portugal, and North Africa (Morocco, Algeria, Tunisia, Libya)
• Has been cultivated for at least 5,000 years — one of the oldest cultivated trees in the Mediterranean
• Archaeological evidence from the Neolithic period shows carob pods were consumed by early humans
• Mentioned in the Bible, the Talmud, and ancient Egyptian texts
• The ancient Egyptians used carob pods as a sweetener and the Greeks used the seeds as standard weights
• First described scientifically by Carl Linnaeus in 1753
• Now widely cultivated throughout the Mediterranean, and also in California, Arizona, Australia, South Africa, and parts of South America
• Spain is the world's largest commercial producer, followed by Italy, Portugal, Morocco, Greece, and Cyprus
• The species has naturalized in many Mediterranean-climate regions worldwide
• Carob orchards can remain productive for over 100 years
• Traditional Carob landscapes are important elements of Mediterranean cultural heritage
• Native to the Mediterranean basin — found wild in southern Turkey, Syria, Lebanon, Israel, Palestine, and Cyprus
• Also native to parts of Greece, southern Italy, Spain, Portugal, and North Africa (Morocco, Algeria, Tunisia, Libya)
• Has been cultivated for at least 5,000 years — one of the oldest cultivated trees in the Mediterranean
• Archaeological evidence from the Neolithic period shows carob pods were consumed by early humans
• Mentioned in the Bible, the Talmud, and ancient Egyptian texts
• The ancient Egyptians used carob pods as a sweetener and the Greeks used the seeds as standard weights
• First described scientifically by Carl Linnaeus in 1753
• Now widely cultivated throughout the Mediterranean, and also in California, Arizona, Australia, South Africa, and parts of South America
• Spain is the world's largest commercial producer, followed by Italy, Portugal, Morocco, Greece, and Cyprus
• The species has naturalized in many Mediterranean-climate regions worldwide
• Carob orchards can remain productive for over 100 years
• Traditional Carob landscapes are important elements of Mediterranean cultural heritage
Ceratonia siliqua is a medium-sized, evergreen tree with a broad, rounded crown and leathery foliage.
Size and habit:
• Typically grows 8 to 15 meters tall, occasionally reaching 20 meters
• Crown is broad, spreading, rounded to dome-shaped, providing dense shade
• Trunk is 30 to 80 cm in diameter, with rough, grayish-brown bark
• Branches are spreading, often forming a dense, dark canopy
Leaves:
• Large, pinnately compound, 15 to 25 cm long, with 3 to 7 pairs of leathery leaflets
• Leaflets are ovate to elliptical, 3 to 7 cm long, dark glossy green above, paler below
• Leaves are evergreen, leathery, and thick-textured
• Entire margins (smooth edges)
Flowers:
• Small, reddish-green, without petals, in short racemes or clusters on older wood and sometimes on the trunk
• Male and female flowers on separate trees (dioecious), though some trees are hermaphroditic
• Flowers appear in autumn to early winter
• Pollinated by wind and insects
• A distinctive characteristic: flowers are borne directly on the trunk and older branches (cauliflory)
Fruit:
• The iconic, elongated, flattened pods (legumes), 10 to 25 cm long and 1.5 to 2.5 cm wide
• Pods are green when immature, turning dark brown to glossy chocolate-brown when ripe
• Pods are leathery, indehiscent (do not split open naturally)
• Sweet, pulpy interior contains 5 to 15 hard, oval, brown seeds embedded in a sugary matrix
• Seeds are remarkably uniform in weight (~200 mg each)
• Pods take approximately 11 months to mature from flowering
Size and habit:
• Typically grows 8 to 15 meters tall, occasionally reaching 20 meters
• Crown is broad, spreading, rounded to dome-shaped, providing dense shade
• Trunk is 30 to 80 cm in diameter, with rough, grayish-brown bark
• Branches are spreading, often forming a dense, dark canopy
Leaves:
• Large, pinnately compound, 15 to 25 cm long, with 3 to 7 pairs of leathery leaflets
• Leaflets are ovate to elliptical, 3 to 7 cm long, dark glossy green above, paler below
• Leaves are evergreen, leathery, and thick-textured
• Entire margins (smooth edges)
Flowers:
• Small, reddish-green, without petals, in short racemes or clusters on older wood and sometimes on the trunk
• Male and female flowers on separate trees (dioecious), though some trees are hermaphroditic
• Flowers appear in autumn to early winter
• Pollinated by wind and insects
• A distinctive characteristic: flowers are borne directly on the trunk and older branches (cauliflory)
Fruit:
• The iconic, elongated, flattened pods (legumes), 10 to 25 cm long and 1.5 to 2.5 cm wide
• Pods are green when immature, turning dark brown to glossy chocolate-brown when ripe
• Pods are leathery, indehiscent (do not split open naturally)
• Sweet, pulpy interior contains 5 to 15 hard, oval, brown seeds embedded in a sugary matrix
• Seeds are remarkably uniform in weight (~200 mg each)
• Pods take approximately 11 months to mature from flowering
Ceratonia siliqua is an ecologically important component of Mediterranean scrub and woodland ecosystems.
Habitat:
• Mediterranean maquis, garrigue, and open woodland
• Adapted to the Mediterranean climate of hot, dry summers and mild, wet winters
• Extremely drought-tolerant once established
• Grows on a wide range of soil types including calcareous, rocky, and poor soils
• Found at elevations from sea level to approximately 600 meters
Ecological role:
• Flowers provide important late-autumn to winter nectar for bees when few other plants are blooming
• Carob honey is a distinctive, commercially valued product
• Pods provide food for livestock (horses, cattle, goats, pigs) — historically a critical winter fodder
• Seeds are dispersed by animals that eat the sweet pods
• Evergreen canopy provides shade and shelter for wildlife and understory plants
• Deep root system helps prevent soil erosion on dry hillsides
• Supports a diversity of Mediterranean insects and birds
• Old Carob trees with hollow trunks provide nesting sites for birds and bats
• The tree is well-adapted to fire, resprouting vigorously from the base after burns
Habitat:
• Mediterranean maquis, garrigue, and open woodland
• Adapted to the Mediterranean climate of hot, dry summers and mild, wet winters
• Extremely drought-tolerant once established
• Grows on a wide range of soil types including calcareous, rocky, and poor soils
• Found at elevations from sea level to approximately 600 meters
Ecological role:
• Flowers provide important late-autumn to winter nectar for bees when few other plants are blooming
• Carob honey is a distinctive, commercially valued product
• Pods provide food for livestock (horses, cattle, goats, pigs) — historically a critical winter fodder
• Seeds are dispersed by animals that eat the sweet pods
• Evergreen canopy provides shade and shelter for wildlife and understory plants
• Deep root system helps prevent soil erosion on dry hillsides
• Supports a diversity of Mediterranean insects and birds
• Old Carob trees with hollow trunks provide nesting sites for birds and bats
• The tree is well-adapted to fire, resprouting vigorously from the base after burns
Carob pods are highly nutritious and have been a food source for millennia.
• Rich in natural sugars (40-50% sucrose, fructose, and glucose) — pods are sweeter than sugar beets
• Good source of dietary fiber (30-40% of pod weight) — both soluble and insoluble
• Contains 2-4% protein, with all essential amino acids
• Naturally caffeine-free and theobromine-free — safe for those sensitive to chocolate compounds
• Good source of calcium (350 mg per 100 g of carob powder), potassium, and magnesium
• Contains vitamins A, B1, B2, B3, and D
• Rich in polyphenols and antioxidants
• Very low in fat (less than 1%)
• Carob powder has approximately one-third the calories of chocolate
• Locust bean gum (from seeds) is a soluble fiber with prebiotic properties that supports gut health
• Gluten-free and hypoallergenic — suitable for most dietary restrictions
• Rich in natural sugars (40-50% sucrose, fructose, and glucose) — pods are sweeter than sugar beets
• Good source of dietary fiber (30-40% of pod weight) — both soluble and insoluble
• Contains 2-4% protein, with all essential amino acids
• Naturally caffeine-free and theobromine-free — safe for those sensitive to chocolate compounds
• Good source of calcium (350 mg per 100 g of carob powder), potassium, and magnesium
• Contains vitamins A, B1, B2, B3, and D
• Rich in polyphenols and antioxidants
• Very low in fat (less than 1%)
• Carob powder has approximately one-third the calories of chocolate
• Locust bean gum (from seeds) is a soluble fiber with prebiotic properties that supports gut health
• Gluten-free and hypoallergenic — suitable for most dietary restrictions
Planting:
• Propagation from seed, grafting, or budding
• Seeds germinate readily after soaking in warm water for 24 to 48 hours
• Seedling trees are variable and may take 7 to 10 years to bear fruit
• Grafted trees produce fruit in 3 to 5 years and maintain varietal characteristics
• Plant in full sun in well-drained soil
• Adaptable to a wide range of soil types including poor, rocky, calcareous, and sandy soils
• Tolerates alkaline and saline soils
• Hardy in USDA zones 9 to 11 — tolerates temperatures as low as -5°C when mature
• Extremely drought-tolerant once established — requires minimal irrigation in Mediterranean climates
• Space 7 to 10 meters apart in orchard plantings
• Requires male pollinator trees for female fruit production (ratio: 1 male per 8 to 10 females)
• Minimal pruning required
• Harvest pods in late summer to autumn when they turn dark brown
• Trees can remain productive for 80 to 100+ years
• Relatively pest-free — can be affected by carob moth (Myelois ceratoniae)
• Excellent tree for Mediterranean-climate, xeriscape, and water-wise gardens
• Propagation from seed, grafting, or budding
• Seeds germinate readily after soaking in warm water for 24 to 48 hours
• Seedling trees are variable and may take 7 to 10 years to bear fruit
• Grafted trees produce fruit in 3 to 5 years and maintain varietal characteristics
• Plant in full sun in well-drained soil
• Adaptable to a wide range of soil types including poor, rocky, calcareous, and sandy soils
• Tolerates alkaline and saline soils
• Hardy in USDA zones 9 to 11 — tolerates temperatures as low as -5°C when mature
• Extremely drought-tolerant once established — requires minimal irrigation in Mediterranean climates
• Space 7 to 10 meters apart in orchard plantings
• Requires male pollinator trees for female fruit production (ratio: 1 male per 8 to 10 females)
• Minimal pruning required
• Harvest pods in late summer to autumn when they turn dark brown
• Trees can remain productive for 80 to 100+ years
• Relatively pest-free — can be affected by carob moth (Myelois ceratoniae)
• Excellent tree for Mediterranean-climate, xeriscape, and water-wise gardens
Uses:
• Carob powder is used as a natural, caffeine-free chocolate substitute in baking, beverages, and confectionery
• Locust bean gum (LBG or E410) from the seeds is one of the most important natural hydrocolloids in the food industry — used as a thickener, stabilizer, and gelling agent in ice cream, cheese, sauces, and processed foods
• Fresh pods are eaten as a sweet snack throughout the Mediterranean
• Dried pods are ground into carob flour for baking and beverages
• Carob syrup (made by boiling crushed pods) is a traditional sweetener in Cyprus, Malta, and the Middle East
• Carob is used in breakfast cereals, protein bars, and health foods
• Pods are an important livestock fodder, particularly for cattle, horses, and goats
• Pods were historically used as cattle feed in the American West — "California feed"
• Seeds were used as standard weights for gold and gemstones (the origin of the "carat")
• Wood is hard and dense, used for carving, tool handles, and fuel
• Bark and pods are used in traditional medicine for diarrhea and digestive complaints
• Carob is used in cosmetics and skin care products
• Tannins from pods are used in leather processing
• Alcohol is distilled from fermented carob pods in some Mediterranean countries
• The tree is widely planted as an ornamental shade tree in Mediterranean-climate gardens
• Carob powder is used as a natural, caffeine-free chocolate substitute in baking, beverages, and confectionery
• Locust bean gum (LBG or E410) from the seeds is one of the most important natural hydrocolloids in the food industry — used as a thickener, stabilizer, and gelling agent in ice cream, cheese, sauces, and processed foods
• Fresh pods are eaten as a sweet snack throughout the Mediterranean
• Dried pods are ground into carob flour for baking and beverages
• Carob syrup (made by boiling crushed pods) is a traditional sweetener in Cyprus, Malta, and the Middle East
• Carob is used in breakfast cereals, protein bars, and health foods
• Pods are an important livestock fodder, particularly for cattle, horses, and goats
• Pods were historically used as cattle feed in the American West — "California feed"
• Seeds were used as standard weights for gold and gemstones (the origin of the "carat")
• Wood is hard and dense, used for carving, tool handles, and fuel
• Bark and pods are used in traditional medicine for diarrhea and digestive complaints
• Carob is used in cosmetics and skin care products
• Tannins from pods are used in leather processing
• Alcohol is distilled from fermented carob pods in some Mediterranean countries
• The tree is widely planted as an ornamental shade tree in Mediterranean-climate gardens
Fun Fact
The word "carat," the universal unit of weight for gemstones and gold, comes directly from "keration," the Greek name for carob seeds — which are remarkably uniform in weight at approximately 200 milligrams. Ancient Mediterranean jewelers used carob seeds as standard weights on their balance scales, and the modern carat (200 mg) was standardized based on the average weight of a single carob seed. In Cyprus, a traditional carob syrup called "charoupomelo" is made by simmering carob pods for hours, producing a sweet, molasses-like liquid that has been a staple of Cypriot cuisine for thousands of years.
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