I have six huge rhododendron bushes that have a variety of bleeding hearts, azaleas, hostas, forsythia, pussy willows, young trees, old trees, daylilies, daisies, other wildflowers, and some things I can't identify, growing under, through, and around them. Various groundcovers and low-growing plants, including vinca, catmint, lily of the valley, are all growing in abundance around the roots. It looks like a jungle out there and I love it!
Since everything is growing nicely, I assume the rhododendrons are not having a negative affect. However, if I understood the answer correctly, there may be some things I should be aware of for future plantings.
Is there anything I should not plant in the vicinity of my rhododendrons? If so, what?