Marigolds are a common annual flower grown for colour and their ability to repel garden pests. African and French marigold seeds germinate in three to five days at 75 to 80 degree F. Other types of marigolds take up to 10 days.
There are many different types of marigolds that range from 6 to 36 inches tall. The colour varieties include yellow, orange, red, white and multicoloured.
Plant marigold seeds in seed trays filled with moist, good-draining soil. Spray the soil with room temperature water before planting.
Marigold seeds do not require light to sprout. Sprinkle the seeds on top of the soil and cover with vermiculite or sand. Place the seeds in a warm area and keep moist.
Fertilise the marigold seedlings once they develop true leaves. Dilute 15-0-15 water-soluble fertiliser to quarter strength and use twice a week.
Store seeds from one year to another in a cool, dark area. Keep the seeds dry or they may unexpectedly sprout. Protect them from insects and rodents.