Sow at a depth of approx. 0.2 inches
(0.5 cm) and aim for a distance of at least 7.8 inches
(20.0 cm) between Calendula plants. Soil temperature should be kept higher than 10°C / 50°F
to ensure good germination.
By our calculations, you should look at sowing Citrus Mix about 35 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Citrus Mix is a half hardy plant.