Resilient yes but cutting them down to the ground in early spring is pushing even the most resilient plant. You have removed all the newly grown foliage and the plant may, or may not, grow more.

Thanks fro that information. Think I have destroyed them.

Leave the root in the ground it may come back. Time to tidy them up is late autumn when you can remove that years growth if it is looking scruffy.

Thanks Moon growe, will do that, I read on web that the time to cut back was spring. Lesson learned. Thank You

Not all the info you find on the web is accurate unfortunately.