Start seeds indoors six weeks before last frost date.
Sow 0.39 inches (1.0 cm) deep with a guideline distance of 0.78 inches (2.0 cm). Soil temperature should be kept higher than 12°C / 54°F to ensure good germination.Plant to the first set of true leaves to promote strong root growth.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Copper river is a tender plant.