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Karoo Boer-bean
Schotia afra var. afra
SA tree no: 201
English: Karoo Boer-bean, Small Boer-bean, Hottentot's Bean
Afrikaans: Karooboerboon, Karoohuilboerboon, Kleinboerboontjie, Boonenboom, Hotnotsboerboom, Hotnotsboerboontjieboom, Hotnotsboontjie
Xhosa: Umgxam, Umqongci, Intiza
Historical scientific names: Guajacum afrum, Schotia parvifolia, Schotia speciosa, Schotia angustifolia, Schotia tamarindifolia
Schotia afra var. afra, commonly known as Karoo Boer-bean or Karooboerboon, is a beautiful indigenous evergreen to semi-deciduous small tree or multi-stemmed shrub native to the drier parts of the Eastern and Western Cape provinces of South Africa. It is highly prized for its characterful gnarled trunk, fine, feathery foliage, and particularly for its spectacular display of bright red to pink, nectar-rich flowers that profusely cover the tree during its flowering season. This hardy and water-wise plant is an excellent choice for a low-maintenance, ornamental tree in arid and semi-arid gardens, attracting a host of birds and insects and providing an invaluable source of food.
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Distinguishing features
A small, multi-branched, often gnarled tree or large shrub with a rugged appearance.
Features fine, feathery, pinnately compound leaves with numerous small, leathery leaflets.
Produces showy, bright red to deep pink flowers in dense, rounded clusters, appearing profusely on the branches.
Flowers are rich in nectar, often "weeping" from the tree, attracting many birds and insects.
Bears distinctive flattened, woody seed pods that are initially green-pink and ripen to brown.
Seeds are edible when roasted or boiled.
Overall appearance:
Schotia afra var. afra presents as a picturesque small tree, often with an artistic, twisted trunk and a dense, rounded crown. Its fine foliage creates a pleasant texture, while the burst of vibrant red flowers makes it a standout feature in the landscape.
Height:
Typically grows 3 to 5 metres tall, occasionally reaching up to 7 metres in ideal conditions.
Width:
Can spread 3 to 5 metres wide, forming a dense, rounded crown.
Leaves:
Pinnately compound, alternate, typically 2.5–8.5 cm long.
Composed of 6 to 18 pairs of opposite, sessile (stalkless), oblong to elliptic or somewhat sickle-shaped leaflets.
Leaflets are small, typically 5–17 mm long and 1–10 mm wide, tough, leathery (coriaceous), and glossy dark green.
Margins are entire (smooth).
Flowers:
Showy, bright red to deep pink, bell-shaped, 1.5–2.5 cm long.
Borne in dense, many-flowered, almost spherical clusters (panicles) up to 8 cm long, produced on short spur branches directly from the main stems, sometimes even on the old wood.
Produce copious amounts of sticky nectar that often drips from the flowers, giving rise to its Afrikaans common name "Huilboerboon" (weeping boer-bean).
Flowering season:
Primarily flowers in late winter to spring, typically from August to October, but can sometimes extend into early summer.
Fruits:
Flat, woody, oblong pods, 4–12 cm long and 2–4 cm wide.
Initially lime green to pinkish, ripening to light brown.
They are explosively dehiscent, splitting open along two seams when dry to release the seeds.
The pods often persist on the tree for some time.
Seeds:
Flat, disc-shaped to roundish, pale brown to tan, typically 1–2 cm in diameter, with a distinctive, fleshy, pale yellow aril (a small appendage) at one end (though less prominent than in Schotia brachypetala).
Bark:
Dark brown to charcoal grey, often fissured, gnarled, and somewhat twisted, becoming rougher with age. Young branches are paler and can also be twisted.
Stems:
Multiple rigid, twisted, pale branches that contribute to its gnarled, characterful appearance.
Wood:
The wood is hard and tough, historically used for felloes (parts of wagon wheels) and yokes. Not a commercial timber.
Thorns:
This tree is thornless.
Roots:
Possesses a strong, non-invasive root system, making it suitable for planting closer to structures.
Soil type:
Highly adaptable to a range of well-drained soils, including sandy, loamy, and even rocky soils. It thrives in nutrient-poor conditions typical of karroid and arid environments. Good drainage is essential.
Aspect:
Thrives in full sun. It is extremely drought-tolerant once established and very hardy to frost, making it suitable for a wide range of climates including hot, dry inland areas and coastal regions. It tolerates strong winds.
Edibility:
The seeds are edible. They can be eaten green, or roasted and ground into a meal, or boiled to remove astringency. They are nutritious.
Toxicity:
Considered non-toxic. The seeds are edible.
Uses:
Ornamental Tree: A highly desirable small ornamental tree for water-wise, succulent, rock, and arid gardens. Its gnarled form, attractive foliage, and spectacular flowers make it a focal point.
Wildlife Attractor: The copious nectar attracts numerous bird species (especially sunbirds) and insects (butterflies, bees), making it excellent for biodiversity. The seeds are also eaten by birds and small mammals.
Edible Plant: The seeds (often referred to as 'boer-beans') are edible and have been a traditional food source for indigenous people.
Container Plant: Its compact size and non-invasive roots make it suitable for large containers on patios.
Bonsai Subject: Its gnarled trunk and fine foliage lend themselves well to bonsai cultivation.
Hedge/Screening: Can be planted in clusters to form a dense, colourful, impenetrable hedge for privacy.
Ecology:
Pollination: The nectar-rich flowers are primarily pollinated by birds (ornithophily), particularly sunbirds, and various insects.
Seed Dispersal: Seeds are dispersed through an explosive dehiscence of the pods when dry, catapulting seeds away from the parent plant. Birds also play a role by consuming the aril and dispersing the seeds.
Butterfly Host: Larvae of the Brown Playboy butterfly (Deudorix antalus) feed on its leaves.
Browse: Leaves are browsed by various herbivores.
Distribution and habitat:
Schotia afra var. afra is endemic to South Africa.
South African Provinces: Eastern Cape, Western Cape.
Habitat: Found chiefly in dry karroid valley bushveld, scrub, dry broken country, and often along the banks of dry streams and small rivers. It tolerates rocky outcrops and coastal areas.
Derivation of name:
The genus name Schotia honours Richard van der Schot (died 1825), who was the chief gardener of the Imperial Garden at Schönbrunn in Vienna.
The species epithet afra is Latin for "from Africa," indicating its origin on the continent.
The variety epithet afra distinguishes it from Schotia afra var. angustifolia, which has narrower leaflets and a more northern distribution.
"Boer-bean" refers to its edible seeds, traditionally roasted and eaten by early Dutch settlers ("Boer" meaning farmer).
Historical aspects:
Schotia afra var. afra has been a significant plant in the traditional diets and ecosystems of South Africa for centuries. Its edible seeds were a vital food source, particularly in arid regions. It was among the first South African plants to be formally described by European botanists, noted for its resilience and unique characteristics. Its common names reflect its historical and cultural importance.
Interesting facts
This "Karoo Boer-bean" is a true survivor; it thrives in harsh, dry, hot environments where many other trees struggle, making it a champion of water-wise gardening.
When in full bloom, its vibrant red flowers produce so much sticky, sweet nectar that it literally drips from the tree, attracting sunbirds from far and wide!
Its seeds are edible, and historically, they were roasted and eaten, giving the tree its common name 'Boer-bean'.
Growing tips
Propagation: Best propagated from fresh seeds. Seeds have a hard coat and benefit from scarification (e.g., nicking the coat with nail clippers) or soaking in warm water overnight to aid germination. Sow in well-drained, sandy loam. Germination typically occurs within 7 days.
Planting: Prefers a sunny position and well-drained soil. It is tolerant of poor soils but benefits from compost. Plant in a spot where its gnarled form can be appreciated.
Watering: Highly drought-tolerant once established. Water regularly for the first year or two to establish a strong root system, then significantly reduce watering. Avoid overwatering.
Frost: Very frost-hardy. Established plants can withstand significant cold, making it suitable for inland areas.
Maintenance: Low maintenance. Prune only to shape or remove dead/damaged branches. It is a relatively slow-growing tree.
Pests/Diseases: Generally robust. Young foliage might occasionally be susceptible to aphids; use an environmentally friendly insecticidal soap if needed.
This plant is a fantastic alternative for:
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