Assertion: sweet potato's leaf | /r/CapableOf | start to yellow
Facets:
value: to october
type: TEMPORAL
Source sentences:
text: You can harvest as soon as leaves start to yellow, but the longer a crop is left in the ground, the higher the yield and vitamin content.
text: Once the leaves start to turn yellow (typically September to October) they are ready to harvest.
text: Sweet potatoes are ready to harvest when the leaves start to yellow.