Keep in mind when planting that Burgundy Supercrest is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside. Burgundy Supercrest tends to grow best in a soil ph of between 6.1 and 7.5 meaning it does best in weakly acidic soil - weakly alkaline soil.
By our calculations, you should look at sowing Burgundy Supercrest about 49 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Burgundy Supercrest is a tender plant.