Wrapping Up. Evergreen shrubs are probably the most important part of your perennial garden plan. They create an awesome backdrop for your other showcase plants, so they donâ€™t get lost in your house colors or other distracting objects. The importance of evergreen shrubs in your mixed border Please note: You are currently browsing img low border plants landscaping and containers pinterest that is 1000x750px in size. This image is listed in evergreen plants garden ideas category. The importance of evergreen shrubs in your mixed border, 1000x750 in 212.53 KB.