Have a Cornus Hesseyii that is wilting quite a bit–I just bought it 2 days ago. Mostly, it’s in shade with some sun in the afternoon. I’ve watered it a few times since planting but don’t know why it’s wilting.
Your shrub is very new and maybe experiencing some transplant shock. Although the dogwoods are slightly tolerant of seasonal dry periods they prefer moist soils and partially shady conditions for best success. Their inability to grow on extremely dry sites is characteristic to their shallow root system. Mulch well to keep shallow roots cool and retain valuable moisture. Amending your soil with compost will help improve texture and water holding or drainage. When planting a shrub always make sure you dig your hole twice as wide and the same depth as its roots ball. Continue to follow a strict watering schedule for the first year to help establish your new shrub.