Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prae-flōrĕo, ēre, v. n., to flower or blossom before the time (post-Aug.), Plin. 16, 29, 51, § 119.
prae-flōro, āvi, ātum, 1, v. a. [flos], to deprive of its blossoms beforehand; only trop.