Planting under dogwood
I want to add plants under a dogwood (over 30 years old) which is about 7.5 feet behind a 1.5 foot retaining wall at edge of our terrace off our side porch. About 8 feet behind the dogwood is a huge magnolia. Will it hurt the dogwood if I plant shrubs under it? bottlebrush buckeye? Suggestions? Advice? Thanks!