Description
Coffea arabica ‘Castillo’ is a modern cultivar of Arabica coffee developed in Colombia for improved disease resistance, particularly against coffee leaf rust (Hemileia vastatrix), while maintaining high cup quality. It is a compact, evergreen shrub or small tree, typically reaching 2 to 4 meters in height, with glossy, dark green leaves arranged in opposite pairs along its branches.
The plant produces small, fragrant white flowers that resemble jasmine and appear in clusters along the stems, followed by green berries that ripen to bright red “coffee cherries.” Each fruit contains two seeds, commonly known as coffee beans. ‘Castillo’ is valued for its productivity, adaptability, and balanced flavor profile, often described as smooth with mild acidity and good body.
This cultivar performs best in warm, humid, tropical climates at moderate elevations. It prefers partial shade, rich, well-drained soil, and consistent moisture. Protection from strong sun, wind, and temperature extremes helps ensure healthy growth and optimal yield.
Germination Guide
🌍 Colombia
Moderate
Coffea arabica 'Castillo' is a disease-resistant hybrid variety developed by Colombia's Cenicafé research center, now the most widely planted coffee in Colombia. Seeds germinate slowly and require consistent warmth, high humidity, and well-drained soil, with germination typically occurring 30-90 days after sowing depending on temperature and moisture conditions. This variety is prized for its rust resistance and balanced flavor profile of citrus, chocolate, and caramel notes.
Germination
Germination time
Expect germination in
30 – 90 days
Temperature
Min 20°C
Ideal 25°C
Max 30°C
🌡️ Temperature alternation recommended
— Daily temperature alternation between 27-30°C (day) and 20-22°C (night) aids germination. Maintain warm conditions consistently; temperature fluctuations below optimal can reduce germination rates.
Substrate moisture
💧💧 High
Seed Pre-treatment
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💧
Soaking — 48 hours
Soak seeds in room temperature water for 24-48 hours before sowing. Room temperature soaking produces superior results compared to hot water treatments.
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Additional notes
Seeds should be freshly processed, with moisture content kept between 15-22% for optimal germination. Use fresh seeds as viability decreases significantly within three months.
Substrate & Container
Recommended substrate
Well-drained, sandy compost or seed starting mix with sand or perlite for good aeration. Soil and sand mixture (50% forest soil, 50% river sand) works effectively.
Recommended container
Pots or seed trays with drainage holes, covered with humidity dome or plastic wrap to maintain moisture and warmth.
Growing Tips
Keep seeds moist but never waterlogged to prevent damping-off disease. Use a humidity dome or plastic covering during germination. Maintain constant temperatures between 25-30°C for optimal results. Seeds are moisture-sensitive and lose viability rapidly; use fresh seeds and avoid over-drying. Pre-soaked seeds should be sown immediately after soaking. Do not expose seeds to direct sunlight during germination; keep in bright, indirect light. Consider using a heat mat to maintain optimal temperature. Once germination begins (radicle emergence visible), gradually introduce seedlings to fresh air by removing the humidity dome for increasing periods over 1-2 weeks.
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