Assertion: iceberg lettuce's head | /r/HasProperty | firm
Facets:
Source sentences:
text: Harvest the head types when the heads are firm and fully formed.
text: Iceberg lettuce has firm and tight head with crisp and pale green leaves.
text: Harvest crisphead, cos, and butterhead lettuce when the heads are firm and mature.
text: Crisphead is mature when leaves overlap to form a head similar to those available in groceries; heads will be compact and firm.
text: is mature when leaves overlap to form a head similar to those available in groceries; heads will be compact and firm.