The sycamine tree is a plant mentioned in the New Testament, most famously in Luke 17:6, and the majority of biblical scholars and botanists identify it as the black mulberry, known scientifically as Morus nigra. The Greek word used in the original text is sykaminos, which ancient writers consistently applied to the mulberry rather than to any fig species. Because its name looks and sounds so much like “sycamore,” the sycamine has confused readers for centuries, but the two trees are botanically unrelated and look nothing alike.
The Biblical Passage and Why It Matters
The sycamine tree appears by name in only one verse of the Bible. In Luke 17:6, Jesus tells his disciples that faith the size of a mustard seed could command a sycamine tree to uproot itself and be planted in the sea. The passage is about the power of faith, not horticulture, but the choice of tree is not arbitrary. The black mulberry is famously difficult to uproot. Its root system is dense, widespread, and aggressive, sometimes cracking stone walls and foundations. Ancient farmers in the eastern Mediterranean knew this firsthand. So the metaphor carries real force: if your faith can move this particular tree, with its stubborn, sprawling roots, it can move anything.
This practical detail is easy to miss if you don’t know what tree the passage is actually talking about. Many English translations simply render the word as “mulberry tree,” which clears things up. Others keep the transliteration “sycamine,” which sends readers searching for an explanation. Either way, the plant in question is the black mulberry.
Sycamine Versus Sycamore
The single biggest source of confusion around the sycamine is its resemblance, in English, to the word “sycamore.” These are completely different trees. The biblical sycamore is Ficus sycomorus, the sycamore fig, a large tree native to Africa and the Middle East that produces small, clustered figs directly on its trunk and major branches. It is the tree Zacchaeus climbed in Luke 19 to see over a crowd. The sycamore fig can grow enormous, with a broad canopy and a thick, buttressed trunk, and was historically one of the most important trees in Egypt, providing both timber and a large quantity of edible, if inferior, fruit.
1Oxford Academic (Journal of Heredity). THE SYCAMORE FIG IN EGYPTThe sycamine, by contrast, is a mulberry. It belongs to the same broader plant family (Moraceae) as the fig, which may be one reason the names drifted toward each other in ancient usage, but the two genera are distinct. A sycamore fig has rough, somewhat heart-shaped leaves and bears figs year-round in warm climates. A black mulberry has serrated, sometimes lobed leaves and bears small, berry-like fruit that ripens in early summer. They do not look, taste, or grow the same way.
Adding another layer of confusion, the tree most North Americans and Britons call a “sycamore” today is neither of these. In the United States it usually means the American sycamore (Platanus occidentalis), a massive plane tree with peeling, mottled bark. In Britain, “sycamore” typically refers to Acer pseudoplatanus, a maple. None of these have any connection to the biblical sycamine. When you encounter the word in a scriptural context, think mulberry.
What the Black Mulberry Looks Like
The black mulberry is a small to medium-sized deciduous tree, typically reaching about 10 to 12 meters tall, though many specimens stay shorter and develop a wide, gnarled crown over the decades. Older trees have a characteristically rugged look. The trunk is often twisted, the bark darkens and furrows deeply with age, and the limbs spread outward rather than growing straight up. The overall silhouette is broad and somewhat squat compared to many fruit trees, giving mature specimens a distinctly ancient appearance even when they are only a few decades old.
The leaves are large, roughly heart-shaped, with toothed or serrated edges. They tend to be thick, somewhat rough on the upper surface, and a deep, glossy green. In some genotypes the leaves are unlobed; in others they show irregular lobing, sometimes on the same branch. A study of black mulberry genotypes found high variability in several leaf and fruit traits across different populations, including leaf serration and surface coloring, which helps explain why specimens in different regions can look somewhat different from one another.
2Industrial Crops and Products. Phenotypic and chemical variation of black mulberry (Morus nigra) genotypesOne of the tree’s most recognizable features is its fruit. Black mulberry fruits are small, roughly one to three centimeters long, and look like elongated blackberries. They start green, turn red as they ripen, and end up a deep purplish-black when fully mature. The juice stains everything it touches, including hands, clothing, paving stones, and car paint, which is one reason the tree is sometimes planted away from walkways and driveways despite being otherwise well-loved. The fruit is soft and fragile when ripe, bruising easily and deteriorating quickly after harvest.
2Industrial Crops and Products. Phenotypic and chemical variation of black mulberry (Morus nigra) genotypesWhere the Tree Grows
The black mulberry’s origins lie in western Asia. Anatolia (modern Turkey) and Iran are considered the primary centers of the species’ origin, and wild or semi-wild populations still grow across both regions. A genetic survey of black mulberry populations in these areas revealed some unusual features of the species, including a lack of autonomous reproduction and the absence of recognized landraces, suggesting that the tree has been propagated vegetatively by humans for so long that its wild reproductive biology has become somewhat obscured.
3Genetic Resources and Crop Evolution. Decosaploid sour black mulberry (Morus nigra L.) in Western Asia: features, domestication history, and unique population geneticsFrom its native range, the black mulberry was carried throughout the Mediterranean basin thousands of years ago. It was well established in ancient Greece and Rome, where writers like Pliny and Ovid mentioned it. The Greeks clearly distinguished between the mulberry (sykaminos) and the fig-bearing sycamore (sykomoros), a distinction that the New Testament authors inherited. Today the tree grows across southern Europe, North Africa, the Middle East, central Asia, and parts of China. It has also been planted in temperate regions of the Americas, South Africa, and Australia, though it is less common there and is usually found in home gardens rather than commercial orchards.
The tree is reasonably cold-hardy for a subtropical species, tolerating winter temperatures that would kill many fig varieties, but it prefers warm summers and well-drained soil. It is drought-tolerant once established, which suited it well to the dry-summer climates of the ancient Levant, where the biblical writers would have encountered it regularly.
Taste and Culinary Uses
Black mulberry fruit has a reputation as one of the best-tasting fruits in the Morus genus, which is part of why it has been cultivated for millennia rather than replaced by its more productive relatives. The flavor is intensely sweet-tart, with a depth that white mulberries (Morus alba) lack. The tartness comes from a relatively high titratable acidity, and the sweetness from soluble sugars that concentrate as the fruit darkens.
The practical problem with black mulberries is that the fruit is almost impossible to handle commercially. It is too soft, too juice-prone, and too short-lived to survive modern supply chains. The fruits bruise at the slightest contact, and their color and firmness degrade rapidly during storage and transport. Even small drops or vibrations during handling can increase the visible bruise area and reduce firmness and soluble-solids content in both immature and mature berries. That fragility is why you rarely see fresh black mulberries in supermarkets, even in regions where the tree is common.
Instead, the fruit is usually eaten straight off the tree, made into jams and syrups, or dried. In Turkey and Iran, mulberry molasses (pekmez or dooshab) is a traditional sweetener and folk remedy. In parts of the Caucasus and central Asia, dried mulberries are a staple winter food. The fruit also ferments easily, and mulberry wine and spirits have a long history in the eastern Mediterranean.
Mulberry Versus Silkworm Mulberry
People sometimes assume that the mulberry tree associated with silk production is the same species as the biblical sycamine. It is not. The silkworm (Bombyx mori) feeds almost exclusively on the leaves of the white mulberry, Morus alba, which is native to China and was spread across Asia and eventually to Europe specifically for sericulture. The white mulberry has lighter-colored, sweeter, and blander fruit, and its leaves are thinner and smoother than those of the black mulberry.
The two species are related but distinct. Black mulberry has a very high chromosome count, classified as a decosaploid (with roughly 308 chromosomes), making it one of the most polyploid plants known. This extreme genetic complexity is part of the reason the tree is so difficult to breed or hybridize deliberately, and why it has been propagated mainly by cuttings rather than seed for most of its cultivated history.
3Genetic Resources and Crop Evolution. Decosaploid sour black mulberry (Morus nigra L.) in Western Asia: features, domestication history, and unique population geneticsWhite mulberry, by contrast, has a much simpler genome, grows faster, and produces more abundant (if less flavorful) fruit. When European monarchs tried to establish silk industries in the 16th and 17th centuries, they sometimes planted black mulberries by mistake, thinking any mulberry would do. King James I of England famously made this error, ordering thousands of black mulberry trees for English silk production. The silkworms largely refused to eat the tougher, darker leaves, and the venture failed. Many of those trees, however, survived for centuries, and some still stand in English gardens today.
Phytochemistry and Health Interest
Beyond its culinary role, the black mulberry has attracted modern research interest because of the range of bioactive compounds found in its fruit, leaves, and bark. The fruit is rich in anthocyanins, the pigments responsible for its dark color, with cyanidin-3-O-glucoside identified as the dominant anthocyanin. It also contains flavonoids, chlorogenic acid, cryptochlorogenic acid, and protocatechuic acid.
4PubMed Central. Black Mulberry (Morus nigra L.): A Review of Attributes as an Anticancer Agent to Encourage Pharmaceutical DevelopmentLaboratory and preclinical studies have reported that extracts from black mulberry show antioxidant, antimicrobial, anti-inflammatory, and blood-sugar-lowering properties. The whole mulberry plant, including fruit, leaf, bark, and root, has been characterized as a functional food with potential pharmaceutical applications. Reviews of the literature describe effects ranging from antimicrobial and anti-inflammatory activity to protective action against high blood lipids and high blood sugar.
5PubMed Central. Nutritional constituents of mulberry and their potential applications in food and pharmaceuticals: A reviewWhether these laboratory findings translate into meaningful health benefits for people eating ordinary amounts of mulberry fruit remains an open question. Most of the pharmacological data come from cell cultures and animal models rather than human clinical trials. The compounds themselves, anthocyanins and phenolic acids, are found in many dark-colored fruits, not just mulberries. Still, the concentration of these compounds in black mulberry fruit is high enough that the species has become a focus for researchers looking at natural sources of bioactive molecules, and mulberry extracts are increasingly showing up in cosmetic and nutraceutical products.
4PubMed Central. Black Mulberry (Morus nigra L.): A Review of Attributes as an Anticancer Agent to Encourage Pharmaceutical DevelopmentGrowing a Black Mulberry at Home
If you want to grow the tree that the Bible calls a sycamine, the good news is that it is one of the easier fruit trees to establish. Black mulberries tolerate a wide range of soils, need relatively little water once their roots are settled, and are unbothered by most pests. They are best suited to USDA hardiness zones 6 through 10, though they can survive brief cold snaps below that range.
The most common method of propagation is hardwood cuttings taken in winter. You cut a pencil-thick section of dormant wood, plant it in moist soil, and wait. Rooting rates are generally high, which aligns with the species’ long history of vegetative propagation. Growing from seed is possible but slow and unreliable, partly because of the tree’s complex genetics.
A few practical notes worth knowing before you plant one:
- Staining: The fruit drops messily when ripe and will stain patios, decks, and anything parked beneath the canopy. Plant it away from surfaces you care about.
- Root spread: The root system is vigorous and can damage nearby walls, foundations, and paving over time. Give the tree space.
- Slow start, long life: Young trees grow slowly and may not fruit for several years. Once established, though, black mulberries can produce fruit for centuries. Trees 300 to 500 years old are documented in parts of England and Turkey.
- Bird competition: Birds love the fruit at least as much as humans do. If you want a meaningful harvest, you may need netting or simply the willingness to share.
The tree’s longevity is part of its charm. A black mulberry planted today could still be fruiting when your great-great-grandchildren are alive. Few garden trees offer that kind of biological time horizon, and it adds a satisfying symmetry to the idea that this is the same species people were tending in the eastern Mediterranean two thousand years ago, when a teacher from Galilee used it as a metaphor for what faith could accomplish.