arboriculture UK /ɑːˈbɒɹ.ɪˌkʌlt͡ʃə/US /ɑːɹˈbɔːɹ.ɪˌkʌl.t͡ʃɚ/ noun1 •The branch of horticulture concerned with the planting, growth, and maintenance of trees. formsarboricultures