Sorry I didn't take pics before the heavy shower. But they show how the different cultivars handled it.
This 7 1/4" NOID was heavy so I had to hold it up a bit.
PICCADILLY PRINCESS got a bit dissolved
KELLY'S GIRL seemed unaffected
MARCIA FAY wasn't too worried
But this JEDI SUE McCORD or ?? maybe it's SPLENDID TOUCH nearly washed away
Tree peony 'Alice Harding' got splashed with grit as I haven't mulched yet.
She is (at far right of pic) amongst friends ie. east asian plants. All are sheltered by the regrowth of a once big camphor laurel, which will go when the bamboo gets established. They are great shade trees but they come up everywhere. I know a biologist who hates them with passion.