Assertion: ostrich fern | /r/CapableOf | produce true fiddlehead ferns
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Source sentences:
text: Although other ferns such as the lady fern (Athyrium filix-femina; USDA zones 3 through 9) and the bracken fern (Pteridium aquilinum; USDA zones 3 through 11) can also be harvested and eaten, only ostrich ferns produce true fiddlehead ferns.