Citrus medica, commonly known as the citron, is one of the original citrus species native to Southeast Asia and the Himalayan foothills. This slow-growing evergreen tree produces distinctive large, fragrant fruits with thick, bumpy rinds and minimal pulp, prized for their aromatic zest in culinary and religious applications. Seeds exhibit polyembryony and benefit from pre-treatment to enhance germination rates.
Before sowing
Soak seeds in warm water overnight (24 hours) before planting; scarification or seed coat removal significantly improves germination speed and percentage
Sowing
What to expect
Tips
Soak seeds in warm water (25-30°C) for 24 hours before planting. Mechanical scarification or seed coat removal significantly accelerates germination. Sow seeds 1/4 to 1/2 inch deep in well-draining potting mix. Cover pot with plastic wrap or dome to maintain consistent moisture and humidity. Place in warm, indirect sunlight (70-80°F/21-27°C). Keep soil consistently moist but not waterlogged. Germination typically occurs within 2-6 weeks. Once seedlings develop 4-6 true leaves or are sturdy enough to handle, transplant into larger containers. Trees grown from seed may take 4-8 years to produce fruit. Citrus medica displays polyembryony, meaning multiple seedlings may emerge from single seeds.
Sources: Plant World Seeds, plantflowerseeds.com, trifectabotanicals.com, passionforplantation.com, plantiary.com, forwardplant.com, University of Florida IFAS Extension, Wikipedia, PubMed, various horticultural research sources
