If you soak the seeds in a glass of water overnight, before sowing them, they germinate a lot better!
Sow at a depth of approx. 0.5 inches (1.27 cm) and aim for a distance of at least 1.95 inches (5.0 cm) between Garden nasturtium plants.By our calculations, you should look at sowing Trailing Mixed Colours about 14 days before your last frost date.
As the seedlings develop, thin to achieve a final spacing of 25cm.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Trailing Mixed Colours is a hardy plant.