Keep in mind when planting that Crown Terra Cotta Mix is thought of as very hardy, so this plant will tend to survive through freezing conditions. Ideally plant in loamy soil and try to keep the ph of your soil between the range of 6.0 and 7.0 as Crown Terra Cotta Mix likes to be in weakly acidic soil to neutral soil.
By our calculations, you should look at sowing Crown Terra Cotta Mix about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Crown Terra Cotta Mix is a very hardy plant.