Buckthorn

What does Buckthorn look like?

Buckthorns are deciduous or evergreen woody shrubs and small to medium trees, usually growing between one and ten meters tall. Their branches often terminate in sharp, woody spines. The foliage consists of undivided, simple leaves with fine serrations and distinctive veins that arch upward toward the blade tips. Most species are dioecious, bearing male and female flowers on separate individual plants. The blossoms are tiny, yellowish green, and formed in small axillary clusters, racemes, or panicles. Each bloom features four or five pointed sepals arranged in a cup shape, with matching or reduced petals that are sometimes completely missing. After flowering, the plants produce round, berry-like drupes containing two to four hard stones, ripening from green to red or glossy black.

Where does Buckthorn come from?

With approximately 140 recognized species, the genus spans temperate and subtropical climates across the Northern Hemisphere, with smaller native ranges in Africa and South America. Eastern Asia and North America contain the richest diversity of native species. In Europe, common buckthorn was historically known as Spina Cervina and harvested for folk medicine. During later centuries, travelers and gardeners transported various species internationally as ornamental landscape shrubs and hedging. In places such as the United States, Canada, Australia, and New Zealand, introduced buckthorns adapted rapidly to local environments, naturalizing extensively across native woodlands, abandoned pastures, and fragile coastal island reserves.

When and how Buckthorn blooms

Buckthorns are remarkably adaptable plants capable of thriving in shade and poor soils. They reproduce from durable seeds contained inside the fleshy fruit, which spread readily across diverse landscapes. Flowers emerge along leaf joints, opening in modest clusters or branched sprays. Although the leaves and fruit contain unpalatable chemical compounds that deter most foraging animals, buckthorn foliage serves as a vital food source for the caterpillars of numerous moth and butterfly species. In agricultural regions, the bushes also serve as overwintering hosts for pest insects and agricultural fungi.

How Buckthorn is used

Buckthorn components have found diverse applications across craft, industry, and culinary traditions. The berries and bark of several species yield vibrant yellow and green textile dyes, notably the bright china green used on silk and wool. Seed oils are extracted to manufacture soaps, printing inks, and mechanical lubricants. In Ethiopia, the leaves and woody stems of the gesho shrub are an essential ingredient for fermenting the traditional honey mead known as tej. In seventeenth-century England, physicians prepared buckthorn syrups as strong herbal purges, though modern herbalists avoid the plant due to harmful toxic effects.

Kinds of Buckthorn

Botanists accept about 140 species within the genus. Common buckthorn, or Rhamnus cathartica, is a spreading European shrub with four-seeded black berries. Italian buckthorn (Rhamnus alaternus) is an evergreen Mediterranean shrub with robust chemical defenses. In North America, native varieties include the widespread alder-leaf buckthorn (Rhamnus alnifolia) and the western hollyleaf buckthorn (Rhamnus crocea). In parts of southern and eastern Africa, Rhamnus prinoides grows as a glossy-leaved shrub locally called gesho or dogwood.

What Buckthorn means

Historical herbals in England recorded buckthorn syrup as the sole indigenous purgative remedy available during the mid-seventeenth century. Today, buckthorns are widely regulated due to their ecological impact. In New Zealand, Italian buckthorn is strictly prohibited from sale or distribution under national biosecurity accords to safeguard native island ecosystems. In North American farming areas, land managers actively eradicate buckthorn bushes because they shelter soybean aphids and spread fungal crop blights to oat fields.

Questions people ask about Buckthorn

Good reading and sources

• Encyclopaedia BritannicaArticle
• Midwestern frogs decline, mammal populations altered by invasive plant, studies revealScienceDaily, Article
• USDA Plants DatabaseUS Department of Agriculture, Article
• Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
• Where it has been recordedGBIF, Plant database
• Sightings and photos by naturalistsiNaturalist, Plant database

• Rhamnus (plant) on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data