Plant Overview

Botanical name: Solanum chrysotrichum Schltdl.

Common name: Giant devil’s fig (used in some regions)

Plant type: Flowering shrub or woody perennial

Kingdom: Plantae Clade: Angiosperms (flowering plants)

Clade: Eudicots

Clade: Asterids Order: Solanales

Family: Solanaceae (nightshade family)

Genus: Solanum Species: Solanum chrysotrichum

Native range: Mexico and parts of Central America Habitat: Tropical and subtropical environments, including disturbed ground and woodland margins

Height: Potentially several metres under favourable conditions

Spread: Reliable cultivated measurements are limited

Growth rate: Not sufficiently documented for a dependable estimate

Flower colour: White, with prominent yellow anthers Flowering months: No dependable UK flowering calendar confirmed RHS hardiness: No verified species-specific

RHS hardiness rating confirmed

USDA hardiness zones: A dependable species-specific range has not been established

Soil pH: Specific requirements unconfirmed; fertile, slightly acidic to near-neutral soil is a reasonable starting point

Difficulty: Specialist plant requiring warmth and protection in cool climates

Main use: Botanical and ornamental interest; not recommended for food or medicinal use without authoritative species-specific evidence

Botanical Description

Solanum chrysotrichum belongs to the Solanaceae, a diverse flowering-plant family that includes tomatoes, potatoes, aubergines and many ornamental or wild nightshades. The genus Solanum contains thousands of species with widely differing growth habits, habitats and cultivation requirements.

Native to Mexico and parts of Central America, S. chrysotrichum grows in warm environments. It is a prickly shrub or small tree with large, hairy leaves, often featuring deeply lobed margins. The stems and leaves may bear conspicuous, sharp prickles.

The species produces clusters of white, star-shaped flowers with prominent yellow anthers. These are followed by rounded berries that develop from green to yellowish or orange-yellow as they mature.

The name chrysotrichum refers to golden-coloured hairs, a useful clue when investigating the plant’s botanical characteristics. Detailed identification should nevertheless rely on a specialist botanical description rather than this feature alone.

Horticultural information for S. chrysotrichum is relatively limited compared with familiar cultivated species such as tomato. Growing recommendations for the UK should therefore be treated as cautious starting points rather than established species-specific instructions.

Growing Conditions

Position: Provide a warm, bright and sheltered position. Full sun or light shade is a sensible starting point, with protection from strong winds.

Soil type: Use fertile, humus-rich soil that retains moisture while draining freely. Avoid persistently waterlogged conditions.

Soil pH: A species-specific preferred pH has not been confirmed. Fertile garden soil or good-quality container compost is a reasonable starting point.

RHS hardiness: No verified species-specific RHS hardiness rating has been established. Its frost tolerance should not be assumed.

USDA hardiness zones: No dependable species-specific range is confirmed. Its tropical and subtropical origins indicate that protection from frost is advisable.

Watering: Keep the soil moderately and consistently moist during active growth. Allow excess water to drain away, and reduce watering during cooler periods.

Feeding: Use fertile soil and apply a balanced fertiliser during active growth if necessary. Avoid excessive feeding, particularly if it encourages weak, soft growth.

Winter protection: In the UK, protect the plant from frost. Growing it in a substantial container allows it to be moved into a frost-free greenhouse, conservatory or other bright, sheltered space for winter.

How to Grow Solanum chrysotrichum

Choosing a Growing Location

Choose a position with plenty of light, warmth and space. Solanum chrysotrichum can develop into a substantial shrub or small tree, potentially reaching several metres under favourable conditions.

In the UK, container cultivation is a practical way to manage its size and protect it during cold weather. A warm greenhouse or conservatory is worth considering if sufficient headroom is available.

If growing outdoors during summer, wait until the risk of frost has passed. Choose a sheltered site away from paths, narrow passages and places where people might brush against the plant.

Important: The stems and leaves can bear stout prickles. Position the plant where it cannot easily injure people or pets, and wear thick gardening gloves and protective clothing when handling it.

Soil Preparation

Prepare a fertile growing medium that offers both moisture retention and good drainage.

For garden planting:

• Incorporate mature compost if the soil needs improving.
• Avoid heavy, compacted ground that remains saturated.
• Choose a sheltered location where the plant has room to develop.

For container cultivation:

• Use a sturdy pot with drainage holes.
• Choose a good-quality, free-draining compost.
• Select a heavy, stable container to reduce the risk of the shrub becoming top-heavy.
• Increase the pot size as the plant develops rather than placing a small plant immediately into an excessively large container.

Watering and Feeding

Water thoroughly when the upper layer of compost begins to dry. The precise frequency will depend on temperature, pot size, light levels and the amount of foliage.

During warm weather, a vigorous plant may use water quickly. Check container-grown specimens regularly, but do not allow the roots to sit in standing water.

During autumn and winter, reduce watering as growth slows. Plants kept in a warm, bright growing space may continue to grow and require more water than those held in cooler conditions.

Feed during active growth with a balanced fertiliser, following the manufacturer’s instructions. Adjust feeding according to growth and the condition of the foliage.

Growth and Maintenance

Allow plenty of room for the plant’s branches and large leaves. The foliage can be several tens of centimetres long, with deeply lobed margins and conspicuous hairs.

Provide support if a young plant becomes unstable. Prune only when necessary to remove dead, damaged or badly positioned branches, and avoid placing cut material where children or animals might handle it.

Because the plant can develop prickles on both stems and leaves, use suitable gloves and long sleeves when pruning. Clean tools after use and take care when moving pots or handling cuttings.

Do not assume that it will remain a compact ornamental shrub in a small garden. Its eventual size will depend on growing conditions, and it may become a substantial woody plant.

Flowering

Solanum chrysotrichum produces clusters of white, star-shaped flowers with prominent yellow anthers. Individual flowers are relatively large and stand out against the plant’s distinctive foliage.

The flowers are followed by rounded berries that change from green to yellow or yellowish-orange as they mature.

Flowering months: A dependable flowering period in UK cultivation has not been established. Flowering time may vary with temperature, light levels and growing-season length.

Flowering is more likely when the plant has sufficient warmth, light and active growth. Record the timing of flowering and fruit development if growing it as a botanical specimen.

Propagation

Species-specific propagation guidance for UK gardeners is limited, but seed is a possible method of reproduction when correctly identified, viable seed is available.

Growing from Seed

If suitable seed is available:

1. Use clean seed trays or small pots filled with a fine, free-draining seed compost.
2. Sow according to the supplier’s instructions, avoiding unnecessarily deep sowing.
3. Maintain gentle warmth and consistent moisture without waterlogging.
4. Provide good light after germination.
5. Pot seedlings on when they are large enough to handle safely.

Germination time and any requirement for seed pretreatment should be confirmed with the supplier or a specialist propagation reference.

Stem Cuttings

Stem cuttings may be worth trialling, although dependable species-specific success rates and propagation protocols are not established here.

If attempting cuttings, use a healthy, non-flowering shoot and a clean propagation medium in a warm, bright environment. Maintain suitable humidity while keeping the medium moist but aerated, and monitor for rooting and fungal problems.

Wear protective gloves when collecting or preparing material because stems and leaf stalks may carry sharp prickles.

Important Propagation Considerations

Avoid distributing seed or fruit where the plant could escape cultivation. Solanum chrysotrichum is regarded as an environmental weed in some regions outside its native range, including parts of Australia.

Prevent unwanted seed dispersal by monitoring fruit development and removing developing berries carefully when seed production is not required. Dispose of plant material responsibly.

Common Growing Problems

Cold damage: Frost tolerance is not reliably established for UK cultivation. Protect the plant from freezing conditions and overwinter it in a frost-free location.

Waterlogged roots: Persistently wet compost can damage roots. Use a well-drained growing medium and pots with drainage holes.

Poor growth: Insufficient warmth, low light, inconsistent watering or depleted compost may limit growth. Change growing conditions gradually and observe the plant’s response.

Prickles and handling injuries: Stems and leaves can bear sharp prickles. Wear sturdy gloves and protective clothing when pruning or repotting.

Potential toxicity: The plant may contain toxic compounds, as do many members of the nightshade family. Do not eat the leaves, berries or other plant parts, and keep the plant away from children and pets.

Unwanted spread: Avoid allowing ripe berries to be dispersed outdoors. Remove developing fruit carefully if seed production is not wanted, and dispose of plant material responsibly.

Identification errors: Solanum chrysotrichum can be confused with other prickly species of Solanum. Confirm the botanical identity before relying on cultivation, toxicity or propagation information for a related species.

UK Growing Calendar

This is a cautious trial-growing schedule rather than a verified species-specific calendar.

• Spring: Begin seed propagation under protected, warm conditions if suitable seed is available. Pot on established seedlings as necessary.
• Late spring: Gradually acclimatise established plants to outdoor conditions once the risk of frost has passed.
• Summer: Provide warmth, good light and regular watering. Monitor growth and maintain space around the prickly branches.
• Late summer–autumn: Observe flowering and fruit development, and prevent unwanted seed dispersal.
• Autumn: Move container-grown plants into protected conditions before cold weather arrives.
• Winter: Keep the plant frost-free, provide as much suitable light as possible and reduce watering if growth slows.

Summary

Solanum chrysotrichum is a large, prickly shrub or small tree native to Mexico and parts of Central America. It belongs to the Solanaceae family and is recognised by its large, often deeply lobed hairy leaves, sharp prickles, clusters of white star-shaped flowers and rounded yellowish mature berries.

For UK cultivation, a warm, bright, sheltered position and fertile, well-drained soil are sensible starting points. Container growing offers practical advantages because the plant can be protected from frost and its size managed more easily.

The main considerations are its potentially substantial size, sharp prickles, potentially poisonous plant material and ability to spread by seed. Treat the cultivation advice as provisional where species-specific evidence is lacking, and avoid eating any part of the plant.