1.     Seed Collection: Collect seeds from mature Camellia japonica plants. Wait until the seed pods have matured and turned brown before harvesting the seeds.

2.     Seed Preparation: Remove the seeds from the seed pods and soak them in water for 24 hours. This softens the seed coat and can improve germination rates.

3.     Seed Stratification (Optional): Some sources recommend stratifying Camellia seeds by placing them in a moistened paper towel or sphagnum moss and storing them in a plastic bag in the refrigerator for 1-2 months. This cold treatment can help break seed dormancy and improve germination rates.

4.     Soil Preparation: Prepare a well-draining planting mix using a combination of peat moss, perlite, and sand. Camellias prefer slightly acidic soil with a pH of 5.5 to 6.5.

5.     Sowing Seeds: Plant the prepared seeds about 1/2 inch deep in small pots or seed trays filled with the planting mix. Place one seed per pot or space them out evenly in the seed tray.

6.     Moisture and Temperature: Keep the soil consistently moist but not waterlogged. Maintain a warm temperature of around 70-75°F (21-24°C) to encourage germination. You can cover the pots or trays with plastic wrap to help retain moisture.

7.     Light: Provide bright, indirect light for the seedlings. Avoid direct sunlight, as it can scorch the delicate seedlings.

8.     Germination: Germination can take anywhere from several weeks to several months, so be patient. Keep monitoring the pots or trays for signs of germination, such as the emergence of seedlings.

9.     Transplanting: Once the seedlings have developed several sets of true leaves and are large enough to handle, transplant them into individual pots filled with potting soil. Keep them in a sheltered location with filtered sunlight for the first few weeks after transplanting.

10. Care: Keep the soil consistently moist and provide regular fertilization with a balanced fertilizer formulated for acid-loving plants. Protect the young seedlings from extreme temperatures, strong winds, and pests.

11. Hardening Off and Outdoor Planting: After the last frost date in your area, gradually acclimate the seedlings to outdoor conditions by placing them outside for increasing periods each day. Once they are hardened off, transplant them into their permanent location in the garden, ensuring they receive filtered sunlight and protection from harsh afternoon sun.

Growing Camellia japonica from seeds requires patience and careful attention to environmental conditions, but with proper care, you can enjoy the beautiful flowers of these stunning plants in your garden.

The average germination rate of Camellia japonica (often referred to as Camellia grandiflora) seeds can vary depending on several factors such as seed quality, age, environmental conditions, and specific cultivars.

In general, Camellia japonica seeds have a germination rate that ranges from 50% to 80% under optimal conditions.