Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
frŭtĭcesco, ĕre, v. inch. n. [frutex], to put forth shoots, to sprout, become bushy (very rare): quia (hae arbores) celeriter fruticescunt, Plin. 17, 27, 45, § 257.