Answer: Rhaphiolepis (Indian Hawthorn) would be my choice for the area. The blooms give way to dark blue fruit (so no deadheading required). Birds like the fruit and what they don't consume will remain on the plant throughout the winter, which will bring an additional element of interest to the plantings. Rhaphiolepis is reasonably maintenance-free but you may want to trim it back every few years. They are considered low-growing but mature plants can eventually creep up to 4 or 5' in height. The smallest variety (2-4' tall) is 'Ballerina'. The foliage of this one takes on a reddish tinge in the winter. Coupled with Mugo pines and your heather, Indian Hawthorn will make a spectacular planting with year 'round interest.
Best wishes with your landscape!
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