Start seeds indoors six to eight weeks before last frost date.
Try to aim for a seed spacing of at least 0.98 inches (2.5 cm) and sow at a depth of around 0.25 inches (0.64 cm). Soil temperature should be kept higher than 20°C / 68°F to ensure good germination.By our calculations, you should look at sowing Horizon (Orange) about 60 days before your last frost date.