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.
• Lightly scarify seeds with sandpaper to improve water absorption.
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.
• Mist lightly and cover with plastic or a humidity dome to maintain moisture.
Temperature & Light
• Maintain a warm temperature of 75–85°F (24–29°C).
• Provide bright, indirect light or use grow lights for 12–14 hours/day.
Germination Time
• Germination takes 6–12 weeks, and sometimes up to 16 weeks (112 days)
• Be patient—germination is often slow and irregular.
Post-Germination Care
• Once seedlings appear, remove humidity cover or bag.
• 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.