Wishbone Bush

Streptosolen jamesonii is native to the northwestern region of South America, specifically the Andean cloud forests of Colombia, Ecuador, Peru, and Venezuela.

• Found at elevations of approximately 1,000 to 3,000 meters in montane forests
• Thrives in the cool, humid conditions of tropical Andean slopes
• First described scientifically by the English botanist John Miers in 1850
• The plant was introduced to European horticulture in the mid-19th century and has since become a popular ornamental in tropical and subtropical gardens worldwide
• In its native habitat, it grows along forest margins and in disturbed areas where it receives dappled light

The Wishbone Bush is a sprawling, evergreen to semi-evergreen shrub that can reach 1.5 to 2 meters in height and spread, with a loose, open growth habit.

Stems & Branches:
• Stems are slender, somewhat weak, and become woody at the base with age
• Young stems are green and slightly pubescent (covered with fine hairs)
• Branches are long and arching, often requiring staking or support in cultivation
• The plant can be trained against a wall or allowed to sprawl as a mounding shrub

Leaves:
• Simple, alternate arrangement along the stems
• Ovate to elliptic shape, approximately 3–6 cm long and 2–3 cm wide
• Dark green, slightly rough-textured upper surface with prominent venation
• Leaf margins are entire (smooth, without teeth or lobes)
• Slightly aromatic when crushed, a characteristic shared with many Solanaceae members

Flowers:
• Borne in terminal and axillary clusters (corymbs) of 10–30 blooms
• Individual flowers are tubular-funnelform, approximately 2–3 cm long with five rounded lobes
• The corolla tube is characteristically twisted — the defining feature of the genus
• Flowers open bright yellow and progressively change to golden orange, then deep reddish-orange over several days
• Five stamens are fused in a distinctive wishbone or Y-shape arrangement, giving the plant its common name
• Blooms prolifically, with peak flowering in spring and summer, though it can flower nearly year-round in warm climates

Fruit & Seeds:
• Small, inconspicuous capsules approximately 5–8 mm in diameter
• Each capsule contains numerous tiny seeds
• Fruit is not ornamental and is typically removed to encourage continued flowering

In its native Andean habitat, Streptosolen jamesonii occupies a specific ecological niche within montane cloud forests and their margins.

• Prefers cool, humid conditions with moderate temperatures typical of tropical highlands
• Grows in areas with well-drained, humus-rich soils
• Found at forest edges, along streams, and in partially cleared areas where it receives filtered sunlight
• The tubular, color-changing flowers are adapted for pollination by hummingbirds, which are attracted to the bright yellow-to-orange gradient
• The progressive color change may serve as a signal to pollinators, indicating which flowers are newly opened (rewarding) versus older flowers with depleted nectar
• In cultivation, it attracts butterflies and hummingbirds, making it a valuable addition to pollinator gardens

As a member of the Solanaceae family, Streptosolen jamesonii is considered toxic if ingested.

• Like many nightshades, it likely contains alkaloid compounds that can be harmful to humans and animals
• Ingestion may cause gastrointestinal distress, including nausea, vomiting, and diarrhea
• The plant's sap may cause skin irritation in sensitive individuals
• Keep away from children and pets; handle with gloves when pruning

The Wishbone Bush is a popular ornamental shrub in tropical and subtropical gardens, valued for its long-lasting, color-changing blooms and relatively easy care.

Light:
• Performs best in full sun to partial shade
• In hot climates, afternoon shade helps prevent leaf scorch
• More sun generally produces more abundant flowering

Soil:
• Prefers well-drained, fertile soil rich in organic matter
• Tolerates a range of soil types including loam and sandy soils
• A slightly acidic to neutral pH (6.0–7.0) is ideal
• Good drainage is essential — the plant does not tolerate waterlogged conditions

Watering:
• Water regularly during the growing season to keep soil evenly moist
• Reduce watering in winter or during cooler months
• Once established, it shows moderate drought tolerance but performs best with consistent moisture

Temperature:
• Thrives in warm climates; optimal range is 15–30°C
• Can tolerate brief periods of cold down to approximately -2°C but is not frost-hardy
• In temperate regions, it is often grown in containers and brought indoors during winter
• USDA Hardiness Zones: 9–11

Pruning:
• Prune after the main flowering period to maintain shape and encourage bushier growth
• Can be cut back hard if the plant becomes leggy
• Regular deadheading (removing spent flower clusters) promotes continued blooming
• The weak stems may benefit from staking or growing against a wall or trellis

Propagation:
• Semi-ripe cuttings taken in summer root readily with bottom heat
• Can also be grown from seed, though cuttings are preferred for maintaining cultivar characteristics
• Layering is another effective propagation method

Common Problems:
• Aphids and whiteflies may attack new growth, particularly in greenhouse settings
• Spider mites can be a problem in dry conditions
• Root rot may occur in poorly drained soils
• Leggy growth — usually a result of insufficient light

The Wishbone Bush is cultivated almost exclusively as an ornamental plant.

• Widely used as a feature shrub in tropical and subtropical gardens
• Excellent for training against warm walls or fences as an espalier
• Grown in large containers on patios and terraces in cooler climates
• Valuable in pollinator gardens for attracting hummingbirds and butterflies
• The long-lasting, colorful flower clusters are occasionally used as cut flowers
• Sometimes used in mixed borders to provide height and a long season of warm-toned color