Keep in mind when planting that Tera ruffled supreme mix is thought of as very hardy, so this plant will tend to survive through freezing conditions. Tera ruffled supreme mix requires a loamy soil with a ph of 6.0 - 7.0 - it grows best in weakly acidic soil to neutral soil.
By our calculations, you should look at sowing Tera ruffled supreme 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 Tera ruffled supreme mix is a very hardy plant.