Assertion: bracken's frond | /r/CapableOf | turn brown
Facets:
value: by late summer
type: TEMPORAL
value: by early
type: TEMPORAL
Source sentences:
text: In September, shortening days and colder temperatures trigger the withdrawal of chlorophyll from the fronds, which turn bright yellow and then brown, as they die off for the winter.
text: Fronds turn brown and die back in the winter, although rhizomes are still alive.
text: Then by late summer or early, the mature fronds will turn brown and eventually die back by the winter.  
text: In England bracken stands can be a distinctive and attractive feature in the landscape, particularly in the autumn when the fronds turn brown.