Solanum betaceum (synonymous with Cyphomandra betacea), commonly known as tamarillo or tree tomato, is a subtropical evergreen shrub native to the high-altitude Andes Mountains of South America. The 'Rojo Grande de Carmelo' cultivar produces remarkably large, deeply colored red fruits with tangy-sweet flavor. Seeds germinate readily in warm, consistently moist conditions with temperatures between 15-28°C, typically sprouting within 7-28 days in well-draining seed-starting soil with bright light exposure.
Before sowing
Thoroughly clean seeds to remove all pulp and dried fruit residue, which contains natural germination inhibitors. Seeds must be completely dry before storage
Sowing
What to expect
Tips
Surface sow or lightly cover seeds with soil; light exposure improves germination rates. Keep soil consistently moist but never waterlogged to prevent seedling damping-off and stem rot. Maintain soil temperature of 20-25°C (68-77°F) with bottom heat if available. Use a humidity dome or plastic cover to retain moisture and warmth during first 3 weeks of germination. Remove all pulp from seeds before sowing to eliminate germination inhibitors. Optional: soak seeds in warm water for 24 hours or freeze for 24 hours before planting to accelerate germination. Use sterile, well-draining seed-starting mix with pH 6.0-7.0. Transplant seedlings into individual pots once they develop 2-3 true leaves, watering sparingly to avoid rot. Provide bright, indirect light after germination and maintain warm, protected conditions (minimum 15°C) until plants are well-established. Tamarillo seedlings grow vigorously and can reach transplant size within 8-10 weeks.
Sources: Multiple seed producers and horticultural guides (2022-2026)
