Solanum asperolanatum (Devil's Fig): Complete Shrub Growing Guide
Solanum asperolanatum
Solanum asperolanatum (Devil's Fig)
1. Introduction & Taxonomy
Solanum asperolanatum stands among the most spectacular New World nightshades, its enormous woolly leaves and vibrant purple flowers creating bold tropical drama. Native to cloud forests of the northern Andes, this rare ornamental shrub combines architectural foliage with showy blooms that attract immediate attention. Its limited cultivation represents the untapped potential of Andean flora for gardens worldwide. Solanum asperolanatum is notable for its white flowers.
An unusual small tree with prickly branches, large, finely rusty tomentose leaves and clusters of white flowers with yellow stamens followed by yellowish to black fruits. Native to cloud forests in the Andes from Venezuela to Bolivia between 1600 and 3500 m, Solanum asperolanatum prefers a warm or cool temperate climate without extremes of heat or cold in cultivation. However, it is adaptable and will grow anywhere where the summers are not blistering hot and the winters are not freezing cold. Appearance Growth Rate Fast Growth Form Shrub Ornamental Value Beautiful Uses Properties EvergreenFlowering Hazards InvasiveSpiny Gardening Ornamental
Taxonomic Classification
Habitat and Distribution
Solanum asperolanatum is native to Venezuela to Bolivia. It occurs naturally at elevations of 1,600-3,500 m. This species inhabits environments typical of the Solanaceae.
Botanical Note: A diverse family including food crops (tomato, potato, pepper), ornamentals, and medicinal plants. Many species contain alkaloids. Flowers typically have 5 fused petals forming a tube or star shape.
Native Range & Distribution Map
The map below shows the native range and notable cultivation regions for Solanum asperolanatum.
2. Biology & Morphology
Growth Form & Architecture
Solanum asperolanatum is an evergreen broadleaf shrub maintaining dense, lustrous foliage year-round. This dependable greenery provides consistent structure and privacy in the landscape.
Flowers & Reproductive Structures
Shrub flowers vary enormously across families, from tiny wind-pollinated catkins to large, showy insect-pollinated blooms. The flowers are white in colour.
Key Characteristics
- Height: 1-3m
- Growth Habit: Erect Shrub
- Growth Rate: Moderate under optimal conditions
- Life Cycle: Perennial
- Armature: Spiny or thorny
3. Reproduction & Propagation
Primary propagation methods for Solanum asperolanatum: Cuttings, seed, or layering (varies by species).
Propagation Methods
Semi-hardwood cuttings taken in late summer. Layering for difficult-to-root species. Seeds may need stratification.
Propagation Tip: Wound the base of cuttings and use rooting hormone for best results.
4. Cultivation Requirements
Soil / Substrate
Rich, well-draining soil with organic matter. Many prefer slightly acidic conditions (pH 5.5-6.5).
Watering
Consistent moisture during growing season. Mulch to retain soil moisture.
Light Requirements
Full sun to partial shade. Most ornamental shrubs perform best with at least 4-6 hours of direct light daily.
Temperature
- Optimal Growth: 18-30°C (65-86°F)
- Minimum Tolerance: -12°C (10°F)
- USDA Hardiness: Zones 8-11
Pruning
Light pruning after flowering. Can be formally clipped for hedging. Remove dead or diseased wood anytime.
Fertilization
Apply a balanced slow-release fertilizer in spring. Most shrubs are moderate feeders.
Common Cultivation Mistake: Over-watering is the most common cause of shrub failure. Ensure good drainage and match watering to the species' natural habitat.
Seasonal Care Calendar
Follow this season-by-season guide for optimal care timing throughout the year.
🌱 Spring (March–May)
Resume growth and watering; apply balanced fertilizer monthly during growing season; prune to shape if needed; repot if rootbound.
☀️ Summer (June–August)
Peak flowering; maintain consistent moisture; provide afternoon shade in hot climates; monitor for pests; deadhead spent flowers.
🍂 Fall (September–November)
Growth slows; reduce fertilization; continue watering; prepare for cooler temperatures; take cuttings for propagation.
❄️ Winter (December–February)
Minimal growth in subtropical areas; protect from frost (hardy to approximately 0°C); reduce watering; may partially defoliate; prune damaged growth in late winter.
5. Diseases & Pests
Solanum asperolanatum is generally robust and pest-resistant when cultural conditions are optimal.
Major Diseases
Root Rot (Phytophthora, Pythium)
Caused by overwatering or poor drainage. Ensure good drainage and avoid waterlogging. Improve soil aeration.
Powdery Mildew
White powdery coating on leaves. Improve air circulation, avoid overhead watering, and apply fungicide if severe.
Leaf Spot (various fungi)
Brown or black spots on foliage. Remove affected leaves, improve airflow, and avoid wetting foliage.
Common Pests
- Scale Insects — Hard or soft scales on stems and leaves; treat with horticultural oil
- Spider Mites — Fine webbing on undersides of leaves in dry conditions; increase humidity
- Mealybugs — White cottony masses at leaf axils; spray with soapy water or neem oil
- Aphids — Cluster on new growth; spray with soapy water or introduce ladybirds
- Whiteflies — Tiny white insects on leaf undersides; use yellow sticky traps
IPM: (1) Choose the right species for your conditions. (2) Maintain good air circulation and hygiene. (3) Monitor regularly and act early. (4) Use chemical controls only as a last resort.
6. Indoor & Container Growing
Solanum asperolanatum can be grown in containers and brought indoors during winter in cold climates.
Container Selection
Use containers with adequate drainage holes. Choose pots at least 5 cm larger than the root ball. Plastic retains moisture longer; terra cotta dries faster.
Indoor Light
Place in the brightest available location. Most shrubs need at least 4-6 hours of direct or bright indirect light.
Container Success Key: Match your container medium to the species needs: free-draining for xerophytes, moisture-retentive for tropical species.
7. Landscape Use & Design
Solanum asperolanatum is a versatile landscape plant offering structure, colour, and seasonal interest.
Design Applications
- Hedging & Screening: Dense shrubs for privacy, windbreaks, and boundary definition
- Foundation Planting: Soften building lines and define entrances
- Specimen / Accent: Showcase plants as focal points in the garden
- Mixed Border: Combine with perennials, grasses, and bulbs for year-round interest
- Topiary & Formal: Shape dense evergreens into geometric or sculptural forms
Companion Planting
- Perennials — Echinacea, Salvia, Lavandula for mixed borders
- Other Shrubs — Layer heights and textures for depth
- Grasses — Ornamental grasses add movement and contrast
- Ground Covers — Underplant with low-growing species for a finished look
Design Principle: Plant shrubs in groups of odd numbers (3, 5, 7) for natural-looking compositions. Repeat key species throughout the garden for cohesion.
8. Cold Climate Strategies
Solanum asperolanatum shows good cold tolerance and can be grown outdoors year-round in many temperate climates.
Hardiness Thresholds
- USDA Zones: 8-11
- Minimum Survival Temperature: -12°C (10°F)
Overwintering Options
- In-Ground Protection: Apply 10-15 cm of mulch over the root zone before first frost. Wrap trunks of borderline-hardy species with fleece.
- Container Culture: Move potted plants to a frost-free garage, conservatory, or cold greenhouse for winter.
- Microclimate Selection: Plant against south-facing walls or in sheltered spots to gain 1-2 zones of extra warmth.
Winter Survival Rule: Most shrub losses occur from late frost after spring growth has started. Avoid premature uncovering.
Frequently Asked Questions
Where can I obtain Solanum asperolanatum?
This species has very limited availability. Search specialist nurseries focusing on rare Solanum species, Andean flora, or unusual ornamentals. Botanical gardens with South American collections may maintain specimens and occasionally offer seeds or plants. Online specialty plant forums and seed exchanges are alternative sources.
Is this species difficult to grow?
Moderately challenging; it requires conditions similar to its cloud forest habitat—cool to warm temperatures (15-25°C), high humidity, bright indirect light, and consistent moisture. Too much heat or dryness causes stress. Not suitable for hot, dry climates without significant environmental modification. Easier in mild, humid coastal or greenhouse conditions.
Are the fruits edible like other Solanum species?
No, fruits should be considered toxic like most ornamental Solanum species. While some Solanum produce edible fruits (tomatoes, eggplants, naranjilla), many others contain toxic alkaloids. Without specific documentation of safety, treat as toxic and ornamental only.
Summary & Key Takeaways
Solanum asperolanatum, is a tree-like member of the genus Solanum (Solanaceae), native to Venezuela to Bolivia. It shows good cold tolerance, making it suitable for temperate gardens.
Key Points to Remember:
- Propagation: Cuttings or seed
- Light: Full sun to partial shade for most species
- Substrate: Well-draining, moderately fertile
- Watering: Moderate — match to species needs
- Hardiness: USDA Zones 8-11, minimum -12°C (10°F)