Croton megalocarpus aka Kenya Croton
Taxonomy ID: 18835
Croton megalocarpus, or croton tree, belongs to the spurge family, Euphorbiaceae. It comes from tropical Africa, from southern Somalia southwards. Its range includes Kenya, Uganda, Tanzania, Zambia and Mozambique. It grows in forests, river-side woods and wooded grassland. In forests, its crown can reach the upper canopy. It grows fast and sheds its leaves. People grow it for shade, wood and other uses.
The listed garden size is about 82 feet (25 metres) tall and wide. Other accounts give heights of 115–118 feet (35–36 metres). Its broad, dense crown has a fairly flat top. The trunk is round and lacks buttresses at its base. It can reach about 4 feet (1.2 metres) across. Some trunks lack branches for 66 feet (20 metres). The bark ranges from dark grey to pale brown. The leaves are long and oval. The supplied sources also show flowers and fruit, but give no bloom dates.
This tree suits tropical regions with a distinct dry season. Reported sites have three to four dry months each year. Annual rainfall ranges from 900 to 1,900 millimetres. Mean annual temperatures range from 11 to 26°C. It needs sun and prefers moist soil with good drainage. Deep, light soils suit it best, including sand and loam. It accepts mildly acid, neutral and mildly alkaline soils. Established trees withstand drought, helped by a deep taproot. PFAF lists USDA zones 10–12.
Gardeners plant it for shade in gardens and along roads. Farmers also keep it to shade coffee plants. It serves in hedges, living fences and windbreaks. Livestock do not graze it, which helps these plantings. Its roots allow food crops to grow beneath the crown. Its nitrogen-rich leaves provide mulch. The wood supplies fuel, charcoal, fence posts and building poles. Sources report that the wood resists termite attack. Seeds also provide dye for wool.
The tree can spread into forest gaps and forest edges. It may become invasive where conditions favour its growth. The sources list no known edible uses for people. They describe traditional medicinal uses for bark, leaves and young twigs. These reports do not establish safe home treatments. The oil has a purgative effect. Dry sawdust can irritate the nose and throat. Smoke from burning wood can irritate the eyes.
Common names
Kenya Croton, Mukinduri, Croton Tree, MusineMore information about Kenya Croton
How large does Croton megalocarpus grow?
Croton megalocarpus is a large deciduous tree that can reach 35 meters (115 feet) in height with a crown spread of up to 25 meters. The cylindrical trunk can grow to 120 cm in diameter, remaining unbranched for up to 20 meters. This fast-growing species can reach 3 meters in just 2 years under favorable conditions and typically lives around 60 years.
How often should I water Croton megalocarpus?
Croton megalocarpus prefers moist soil conditions but develops excellent drought tolerance once established, thanks to its extensive deep root system. In its native habitat, it thrives with 900-1,900 mm annual rainfall and tolerates dry seasons of 3-4 months. Young trees benefit from regular watering, while established specimens can survive extended dry periods.
What soil does Croton megalocarpus need?
Croton megalocarpus performs best in light, deep, well-drained soils with a pH ranging from mildly acidic to mildly alkaline. While the tree shows preference for sandy-loamy soils, it demonstrates adaptability to various soil types once established. Good drainage is essential to prevent root issues.
What temperature range does Croton megalocarpus tolerate?
Croton megalocarpus thrives in tropical climates with mean annual temperatures of 11-26°C (52-79°F). It is frost-tender and suited to USDA hardiness zones 10-12. In its native East African habitat, it grows at elevations between 700-2,400 meters where temperatures remain warm year-round without freezing conditions.
How do you propagate Croton megalocarpus?
Croton megalocarpus is propagated primarily from seed, with excellent germination rates of approximately 95% within 45 days without pre-treatment. Seeds should be collected fresh from fallen fruit, as viability decreases over time due to high oil content. Refrigerated storage at 3°C can maintain 80% germination for up to one year. Each kilogram contains 1,000-1,700 seeds.
Does Croton megalocarpus flower?
Yes, Croton megalocarpus produces conspicuous yellowish-white flowers arranged in pendulous racemes up to 30 cm long. The tree is monoecious, with female flowers clustered near the base and male flowers (with 25-40 stamens) above. Flowering typically begins at 4 years of age, and trees fruit twice annually, approximately 5 months after seasonal rains.
How is Croton megalocarpus pollinated?
Croton megalocarpus flowers are pollinated primarily by insects, especially bees. The conspicuous yellowish-white flowers attract pollinators, and bees visiting these flowers produce a distinctive dark amber honey. This makes the tree valuable in agroforestry systems that integrate beekeeping.
Can Croton megalocarpus grow outdoors?
Croton megalocarpus is exclusively an outdoor tree, native to tropical Africa and suitable for USDA zones 10-12. It requires full sun and develops an extensive root system, making it unsuitable for containers. The tree thrives in tropical and subtropical regions with warm temperatures and no frost, at elevations from 700-2,400 meters.
What are the medicinal uses of Croton megalocarpus?
In traditional African medicine, bark decoctions from Croton megalocarpus are used to treat whooping cough, pneumonia, malaria and other fevers, stomach complaints, and parasitic worm infections. Leaf sap is applied to aid wound healing. However, laboratory tests show bark extracts have only weak antibacterial activity. Modern research is exploring compounds like magnoflorine for potential anxiolytic properties.
What are the practical uses of Croton megalocarpus?
Croton megalocarpus has exceptional practical value. The timber ('musine') is used for furniture, construction, flooring, and joinery. It makes excellent firewood and charcoal. Seeds yield oil for biofuel production, while the protein-rich seed cake feeds livestock. The tree provides shade for coffee plantations, serves as windbreaks and living fences, and supports bee populations for honey production. Its foliage makes good mulch.
What pests and diseases affect Croton megalocarpus?
Croton megalocarpus is notably pest-resistant. The timber has moderate durability against termites and borer attacks, with the wood containing compounds that deter these pests. The tree is not browsed by livestock due to unpalatable compounds, which is why it's commonly used for living fences. Research has identified trans-ozic acid in nut husks, which may contribute to insect resistance.
How difficult is it to grow Croton megalocarpus?
Within its suitable climate range (USDA zones 10-12), Croton megalocarpus is relatively easy to establish from seed with 95% germination rates. The tree is fast-growing, drought-tolerant once established, and pest-resistant. However, it requires full sun, warm temperatures (11-26°C), frost-free conditions, and substantial space for its mature size of up to 35 meters tall.
Sources
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