Sow the seed thinly in pots or trays on a windowsill or in a greenhouse in a good quality, finely sieved, moist compost.
Sow at a depth of approx. 0.23 inches (0.6 cm) and aim for a distance of at least 1.95 inches (5.0 cm) between French marigold plants. For optimal germination, soil temperature should be a minimum of 15°C / 59°F.By our calculations, you should look at sowing Flagstaff about 49 days before your last frost date.
Transplant seedlings spacing them 5cm apart in trays and grow on. Acclimatise the plants to outside conditions and then plant 15 – 23cm apart in a sunny place.
Flagstaff is half hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.