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