Keep in mind when planting that Black Heart 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. Ensure your soil is loamy, sandy and silty and has a ph of between 6.1 and 7.8 as Sweet Potato is a weakly acidic soil to weakly alkaline soil loving plant.
Try to aim for a seed spacing of at least
1.46 feet (45.0 cm) and sow at a depth of around
3.9 inches (10.0 cm).
By our calculations, you should look at sowing Black Heart about 20 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Black Heart is a tender plant.