Keep in mind when planting that Crimson Star is thought of as very hardy, so this plant will tend to survive through freezing conditions.
Ranunculaceae will benefit from chilling for a few weeks before sowing, when growing from seed.
Best covered so seeds are in a dark environment when sown, cover with fine sieved compost or vermiculite.
Try to aim for a seed spacing of at least
11.89 inches (30.48 cm) and sow at a depth of around
0.12 inches (0.3 cm).
By our calculations, you should look at sowing Crimson Star about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Crimson Star is a very hardy plant.