My rhododendrons always bloom in time for Memorial Day weekend.
The center motif is surrounded by flower blooms and there is a nice cluster of rhodies at each corner of the quilt top:
I've read that the symbolism ascribed to the rhododendron is caution or to beware because of the toxicity of the plant. From a literary point of view, Daphne du Maurier's book, Rebecca, (which both thrilled and terrified me as a youngster) featured the bush, perhaps in a way that foreshadowed the evil character of Rebecca. The original Mrs. de Winter was said to have cultivated red rhododendrons and white azaleas (azaleas are toxic too). My rhodies are all pink and purple (the red you see in the above photo are my roses).
It's hot and humid in Pennsylvania this weekend so stay cool and hydrated.