May is the time of Kolkwitzia amabilis.

Pink Cloud ?

That´s enigma. I have thought it is Pink Cloud, but somebody told me, that if they have rose petals and yellow "throat" (I do not know correct English expression), it must be K. amabilis imported here from China at the beginning of the 20th century. That yellow throat is visible in a next detail photo.

Katarina
not familer enough with the finer points to comment on that

That´s reasonable ;-)