Assertion: bracken's frond | /r/HasProperty | produced
Facets:
value: singly
type: DEGREE
Source sentences:
text: The large, roughly triangular fronds are produced singly, arising upwards from an underground rhizome, and grow to 0.3–1 m (1–3ft) tall; the main stem, or stipe, is up to 1 cm (0.4 in) diameter at the base.
text: Plants need to be 3-4 years old before fertile fronds are produced.
text: Plants require an established root system before fertile fronds are produced, typically requiring 3-4 years.