How to Grow Tamarillo
Solanum betaceum
Tamarillo is a fast-growing subtropical tree producing tangy egg-shaped fruit. Grow in a large container or greenhouse border in frost-prone areas. Provide full sun, shelter from wind, and keep frost-free over winter. Fruits within 18 months from seed.
Yearly Lifecycle
Care Essentials
Feed fortnightly with a balanced liquid fertiliser during the growing season (spring through autumn). Switch to a high-potash feed once flowers appear to encourage fruit set.
Watch For
- Aphids
- Whitefly
- Powdery mildew
- Red spider mite (under glass)
- Frost damage
Companions
Pepino, Cape Gooseberry, Banana Plant, Passionfruit
Track your Tamarillo care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Full sun — minimum 6 hours direct sun daily
Tamarillo demands a bright, sunny position. Under glass in the UK, place it where it receives maximum light. Insufficient light reduces fruiting and promotes soft, disease-prone growth.
💧 Watering
Regular but not waterlogged — keep evenly moist
Water consistently during the growing season, allowing the top 2-3 cm of compost to dry between waterings. Reduce watering significantly in winter but never let the rootball dry out completely.
🌱 Fertilizing
Fortnightly liquid feed spring to autumn, switching to high-potash at flowering
Apply a balanced liquid fertiliser every two weeks from bud break through to leaf fall. Once flower buds form, switch to a tomato-type high-potash feed to promote fruit set and flavour.
✂️ Pruning
Annual late-winter prune to shorten stems and remove dead wood
Prune before new growth begins in late winter or early spring. Shorten the main stem and leading branches by up to one third, remove dead or crossing wood, and open up the centre to light. Tamarillo fruits on new wood so this directly drives yield.
❄️ Overwintering
Must be kept frost-free — minimum 5°C
Move container-grown plants indoors or into a heated greenhouse before the first frost (typically October in the UK). Maintain a minimum of 5°C. Reduce watering during dormancy but check the rootball does not dry out completely.
Growing Tips
Shelter from Wind
Tamarillo has shallow roots and brittle branches that snap easily in strong gusts. Always position it in a sheltered spot or against a south-facing wall.
Pot Culture Works Well
Growing in a large container (minimum 40 litres) lets you move the plant indoors effortlessly each autumn. Use a loam-based compost and re-pot every two to three years.
Fruits on New Wood
Tamarillo bears fruit on the current season's growth. Annual pruning in late winter to shorten stems and remove crossing branches directly improves the following year's harvest.
Fast from Seed
Plants grown from seed fruit within 18 months, making tamarillo one of the fastest fruiting trees you can grow. Take softwood cuttings in summer to propagate named selections true to type.
Pests & Diseases
Pest Aphids
Identification: Clusters of small soft-bodied insects on shoot tips and the undersides of young leaves, causing leaf curl and sticky honeydew deposits.
- Spray with a strong jet of water to dislodge colonies from shoot tips.
- Apply an insecticidal soap spray, covering all leaf surfaces thoroughly.
- Spray with a pyrethrum-based insecticide, taking care to cover shoot tips and leaf undersides.
Pest Whitefly
Identification: Tiny white winged insects that flutter up in clouds when the plant is disturbed. Sticky honeydew and sooty mould on leaves below.
- Introduce the parasitic wasp Encarsia formosa as a biological control under glass.
- Use yellow sticky traps to monitor and reduce adult populations.
- Spray with a pyrethrum-based insecticide in the evening when pollinators are inactive.
Pest Red Spider Mite
Identification: Fine pale stippling on leaves, with tiny bronze or red mites visible under magnification on leaf undersides. Fine webbing in severe cases.
- Introduce predatory mite Phytoseiulus persimilis as biological control under glass.
- Mist foliage regularly to raise humidity, as spider mites thrive in hot dry conditions.
- Apply a miticide approved for use on edible crops if biological controls are not available.
Disease Powdery Mildew Oidium spp.
Symptoms: White powdery fungal coating on leaves and stems, first appearing on older leaves. Affected leaves may yellow and drop prematurely.
Treatment: Improve ventilation around the plant. Remove and destroy affected leaves. Apply a sulphur-based fungicide if the infection is spreading.
Prevention: Avoid overhead watering. Ensure good airflow under glass. Do not allow the rootball to dry out completely as water stress increases susceptibility.
Disease Frost Damage
Symptoms: Blackened, water-soaked leaves and shoot tips following a frost event. Severe frost kills stems back to soil level or destroys the plant entirely.
Treatment: Remove blackened tissue once the risk of further frost has passed. If the main stem is alive, new shoots may regenerate from the base.
Prevention: Move containers indoors before the first frost (typically October in the UK). Maintain minimum temperature of 5°C. Fleece is insufficient protection for sub-zero temperatures.
Log Tamarillo in your garden — track growth, care, and harvests year after year
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