Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Castle School is thought of as hardy, so Castle School will tend to go dormant or grow slowly over the winter months.
Growing Castle School from seed
By our calculations, you should look at sowing Castle School about 56 days before your last frost date.
Transplanting Castle School
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Castle School is a hardy plant.