Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
summer-flowering is an adjective meaning "of plants that bloom during the summer". It carries one recorded sense.
of plants that bloom during the summer
Definitions, synonyms and semantic relations for summer-flowering come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.