Assertion: truffle | /r/HasProperty | difficult to cultivate
Facets:
value: notoriously
type: DEGREE
Source sentences:
text: Truffles command such high prices because they don’t keep well for very long after they are dug up, and they are difficult to cultivate.
text: They are difficult to find, available only at certain times of the year, and are notoriously difficult to cultivate.