This work presents the results of a study on the morphological and optical properties of InGaN nanowires grown using two different substrate temperature regimes. It is obtained that a gradual increase in the substrate temperature  during the growth process makes it possible to obtain long morphologically homogeneous nanowires with a core-shell structure. The photoluminescence of nanowires is in the green range and is three times higher than that of similar  structures grown in a stationary temperature regime.