Campanula Samantha too tall, ready to flower,falling over.should it be cut back?lovely last year,sloppy now?

Question:

Answers:
Your Campanula Samantha should grow only about 6-8 inches high. It's actually what's considered a groundcover:
http://www.naturehills.com/new/product/p...

Did something else possibly get planted in the same area?

There's a plant with a very similar flower yet a much taller height: Balloon Flower (Chinese Bellflower) can reach 2-3ft:
http://www.gardenguides.com/how-to/tipst...

If it is Balloon Flower rather than theCampanula you can always stake it to keep it upright and looking beautiful.

ENJOY !!