Would you be able to identify perennial in picture included?
Although the picture is somewhat unclear, I believe your plant is a Penstemon. Without seeing close up pictures of the flower head, stems and leaves, it is difficult to determine which variety of Penstemon you have growing up through your evergreen shrub. If you are interested in finding this out, I would suggest you use Google images to compare what you have with the different variety images available online.
This being said, I am attaching a link below with information on this plant from the Royal Horticultural Society, where you will find plant characteristics and care.