Keep in mind when planting that Baronne Alice de Rothschild is thought of as hardy, so Baronne Alice de Rothschild will tend to go dormant or grow slowly over the winter months.
By our calculations, you should look at sowing Baronne Alice de Rothschild about 90 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Baronne Alice de Rothschild is a hardy plant.