Solanum betaceum (formerly Cyphomandra betacea), commonly known as tamarillo or tree tomato, is a fast-growing subtropical evergreen shrub native to the cloud forests of the Andean highlands of South America. The yellow-fruited cultivar produces sweet, mild-flavored fruits and requires warm, consistently humid conditions with bright light for successful germination. Seeds typically sprout within 7-28 days at temperatures between 18-28°C, with 20°C being optimal.
Before sowing
Extract and clean seeds from fully ripe fruit; wash thoroughly to remove all pulp and residue. Soaking in warm water for 12-24 hours is optional but recommended. Fresh seeds germinate better than old seeds.
Sowing
What to expect
Tips
Surface sow or lightly cover seeds with moist seed-starting mix without burying deeply; use bottom heat (heat mat) at 20-25°C (68-77°F) and maintain consistent humidity with a clear plastic cover. Seeds require light exposure for germination, so ensure the plastic dome is clear or remove it once germination begins. Keep soil moist but not waterlogged. Water seedlings sparingly after germination as stems are prone to rot. Once seedlings develop 2-3 true leaves (approximately 3 inches tall), transplant to individual pots. Avoid waterlogging. Yellow varieties typically ripen earlier in the season and produce sweeter, milder fruits compared to red cultivars. The plant will begin fruiting in 1.5-2 years from seed. Maintain moderate humidity levels and provide 6-8 hours of bright light daily for healthy seedling development.
Sources: Quinta dos Ouriques, Plantiary, Plexerus, EarthOne, The Seed Collection, Sheffield Seed Company, PlotMyGarden, Baker Creek Heirloom Seeds, Exotic Seeds Shop
