How to Grow Tamarillo Tree Tomato Seeds (Solanum betaceum) at Home

The Tamarillo, or Tree Tomato (Solanum betaceum), is a fast-growing exotic fruit tree native to the Andes of South America. Producing egg-shaped fruits in shades of red, orange, and yellow, the Tamarillo is prized for its bold, tangy flavor and high nutritional value. It grows quickly from seed and can begin fruiting in as little as 18 months under the right conditions — making it one of the most rewarding exotic fruit trees for home growers.

Shop our Tamarillo Tree Tomato Seeds — part of our Tropical Fruit Seeds collection.

About the Tamarillo (Solanum betaceum)

Solanum betaceum is a fast-growing, soft-wooded tree reaching 10–18 feet tall. It produces clusters of fragrant pink flowers followed by abundant fruit crops. The tree is shallow-rooted and prefers sheltered positions. In frost-free climates it is evergreen; in cooler areas it can be grown as a container plant and overwintered indoors.

Hardiness Zones & Climate

• USDA Hardiness Zones: 9–11 (outdoors year-round); Zones 4–8 in containers
• Frost tolerance: Damaged below 28°F (-2°C); protect from frost
• Ideal temperature range: 50–82°F (10–28°C)
• Best climates: Subtropical, Mediterranean, and warm temperate regions

Step 1: Prepare the Seeds

Tamarillo seeds germinate readily without any pre-treatment, but a brief soak can improve germination speed.

• Soak seeds in warm water for 12–24 hours before sowing.
• Drain and pat dry before planting.
• Fresh seeds from ripe fruit germinate most reliably.

Step 2: Sow the Seeds

Fill seed trays or small pots with a fine, well-draining seed-starting mix.

• Sow seeds ¼ inch (5–6 mm) deep
• 2–3 seeds per cell; thin to the strongest seedling
• Cover lightly with fine vermiculite or seed mix
• Water gently with a mister or fine-rose watering can

Step 3: Provide Warmth for Germination

Tamarillo seeds germinate best with consistent bottom heat.

• Ideal germination temperature: 68–77°F (20–25°C)
• Use a heat mat for consistent results
• Place in a bright location or under grow lights
• Expected germination: 7–21 days

Cover trays with a humidity dome or plastic wrap to retain moisture until germination occurs.

Step 4: Care for Seedlings

Tamarillo seedlings grow quickly once established.

• Remove humidity dome once seedlings emerge
• Provide 6–8 hours of bright light daily (grow lights work well indoors)
• Water when the top inch of soil dries; avoid waterlogging
• Transplant to 4-inch pots when seedlings reach 2–3 inches tall
• Begin fertilizing with a balanced liquid fertilizer at half strength after the first true leaves appear

Step 5: Transplant and Grow On

Tamarillos grow rapidly and will need progressively larger containers or a permanent outdoor spot in warm climates.

• Transplant outdoors after all frost risk has passed
• Choose a sheltered, sunny position protected from strong winds
• Space plants 6–8 feet apart
• In containers, use a 15–25 gallon pot with excellent drainage
• Stake young trees — they are fast-growing but can be top-heavy

Growing Tips

• Tamarillos are shallow-rooted — mulch heavily to retain moisture and protect roots.
• Feed with a high-potassium fertilizer during flowering and fruiting to maximize yield.
• Pinch growing tips at 3–4 feet to encourage branching and a bushier, more productive form.
• Trees are short-lived (5–8 years) but grow so quickly that succession planting is easy.
• In Zone 8 and below, grow in containers and bring indoors before first frost.

Common Germination Problems

Seeds Fail to Germinate

Usually caused by temperatures that are too cool. Ensure consistent warmth of at least 68°F using a heat mat.

Damping Off

Caused by overwatering or poor air circulation. Use a sterile mix, water from below, and ensure good ventilation.

Leggy Seedlings

Caused by insufficient light. Move seedlings to a brighter location or use supplemental grow lights positioned 2–4 inches above the seedlings.

Frequently Asked Questions

How long until a Tamarillo produces fruit?

Seed-grown Tamarillos typically begin fruiting in 18–24 months — one of the fastest fruiting timelines of any exotic fruit tree.

Can I grow Tamarillo indoors?

Yes — in a large container near a south-facing window or under grow lights. Move outdoors in summer for best fruiting.

What do Tamarillo fruits taste like?

The flavor is bold and complex — a mix of tomato, passion fruit, and tamarind with a tangy, slightly bitter skin. Red varieties are more tart; yellow varieties are sweeter.

Is Tamarillo frost-hardy?

No — it is frost-sensitive. Protect plants when temperatures drop below 32°F (0°C).

Final Thoughts

The Tamarillo is one of the most exciting exotic fruit trees you can grow from seed. Its rapid growth, prolific fruiting, and striking appearance make it a standout in any subtropical garden or container collection. With warm temperatures and consistent care, Solanum betaceum will reward you with abundant harvests of unique, nutritious fruit.

Ready to grow your own? Shop our Tamarillo Tree Tomato Seeds and browse our full Tropical Fruit Seeds collection at Seed Head Exotics.

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