In areas where there is a prolonged dry season, sweetpotato vines die due to lack of moisture or through being eaten by livestock and so are not available to supply cuttings. When the rains come and farmers want to plant straight away, there are no planting materials available. Farmers typically then have to wait for the rains to cause vines to emerge from old roots that were left in the field, causing delays in planting. This lack of planting materials at the on-set of rains is a major constraint to sweetpotato farming in sub-Saharan Africa.
The Triple S (Storage of roots in Sand then Sprouting) technology is being validated in new contexts in sub-Saharan Africa. Triple S can be used for conservation and multiplication of sweetpotato planting material in areas with an extended dry season.