I have three Clematis vines, growing in three different spots. All three started off the season blooming well, and as of the end of May, two are still at it. Unfortunately one not only stopped blooming, even the vine appears to have died. It’s at the corner of a roof and so got a lot of runoff from the incessant rain this month, so it’s possible it drowned. They are hardy little bastards though, so perhaps next spring it will rise, Lazarus like and bloom again.