Dianthus prefer well-drained soil and can suffer during very wet winters. To protect plants that are susceptible to rot in wet winter conditions, ensure they are planted in well-draining soil and consider adding grit or sand to the surrounding planting area to improve drainage. Raise beds or plant in containers if necessary, and avoid spots where water collects. If wet conditions are unavoidable, consider using a cloche or cold frame to shield the plants from excessive moisture.Trim back lightly after flowering to promote new basal growth. Prune more closely in spring, as new shoots emerge to maintain a tidy shape.