Sow at a depth of approx.
0.25 inches (0.635 cm) and aim for a distance of at least
11.9 inches (30.5 cm) between Common yarrow plants. Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Raspberry Ripple about 49 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Raspberry Ripple is a hardy plant.