Seed Preparation (Before Planting)
• Soak seeds in warm water for 24 hours to soften the seed coat.
• Cold stratify for 30 days in the refrigerator using a sealed plastic bag with moist paper towel, sand, or vermiculite (35–40°F / 2–5°C).
If seedlings sprout in the fridge, remove them gently and plant immediately.
Soil Requirements
• Use a well-draining, acidic mix (pH 5.0–6.0).
• Ideal blend: peat moss + perlite + sand.
• Keep soil moist but not soggy before sowing.
Sowing Instructions
• Surface sow seeds and lightly press into the soil.
• Optionally dust with a very thin layer of fine soil or vermiculite.
Temperature & Light
• Maintain a warm temperature of 75–85°F (24–29°C).
• Use grow lights to maintain 12–16 hours of light per day.
Humidity: Use a humidity dome or clear cover to maintain consistent moisture during germination. Open the dome BRIEFLY once per day to allow fresh air in and reduce mold risk. Remove the dome entirely once seedlings emerge.
Germination Time
• Germination takes 6–12 weeks (AFTER stratification), and sometimes up to 16 weeks (112 days)
• Be patient—germination is often slow and irregular.
Post-Germination Care
• Provide indirect light and gentle airflow.
• Transplant when seedlings have 2–3 sets of true leaves, handling with care to avoid root damage.
Ongoing Care
• Water regularly, letting the topsoil dry slightly between waterings.
• Maintain high humidity (50%+).
• Fertilize during the growing season with an acidic, balanced fertilizer.
With care and patience, your Gardenia jasminoides will flourish into a fragrant and stunning evergreen beauty.