Most leaves of sweet potato have two basal lobes and they should not be counted. Record the predominant number of the lateral and central leaf lobes observed on the leaves located in the middle of section of the vine.

Generally sweet potatoes have 1,3,5,7 or 9 leaf lobes. If the leaf has no lateral lobes but shows a central tooth this number is 1. If the apical portion of the leaf is totally rounded this number is 0.