How to grow French marigold 'Colossus'
Keep in mind when planting that Colossus is thought of as half hardy, so remember to protect this plant from frosts and low temperatures.
Growing Colossus from seed
Soil temperature should be kept higher than 20°C / 68°F to ensure good germination.
Transplanting Colossus
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Colossus is a half hardy plant.
Harvesting Colossus