Hi Tim,
here's an update. Unfortunately no chance to hybridize as sometimes it rained in the evening (like today) or I was away. Maybe one of the next days will work.
Y. filamentosa "Ice bear", a late bloom
Y. "monster"
Y. flaccida x louisianensis
Y. fila "colour guard"
Y. karlsruhensis x "Elenas Stars" from Benny
Y. "floribunda"
Eckhard