Keep in mind when planting that Korean Purple is thought of as tender, so it is really important to ensure that the outside temperature is well above freezing before planting or moving outdoors. Korean Purple needs a loamy, sandy and silty soil with a ph of 6.1 to 7.8 (weakly acidic soil to weakly alkaline soil).
Will not come true from seed – sterile.
Look to ensure a distance
1.46 feet (45.0 cm) between seeds when sowing - bury at a depth of at least
3.9 inches (10.0 cm) deep.
By our calculations, you should look at sowing Korean Purple about 20 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Korean Purple is a tender plant.