Keep in mind when planting that Swan Burgundy and White is thought of as hardy, so Swan Burgundy and White will tend to go dormant or grow slowly over the winter months. Ensure your soil has a ph of between 5.1 and 6.0 as Swan Burgundy and White is a weakly acidic soil loving plant.
By our calculations, you should look at sowing Swan Burgundy and White about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Swan Burgundy and White is a hardy plant.