Yes. Grasses sometimes take a year or two to settle in. I had the same issue with my Stipa Gigantea. However, pampas grass doesn't usually flower till autumn, so keep your fingers crossed for flowering this year. :)

Rosie's right - they may yet flower. My one used to flower mid to late October, but my neighbour's round the corner flowered in September. I also recall I got no flowers on mine for the first 2 or 3 years.

Thanks Rosierose and Bamboo, your comments are much appreciated. Fingers crossed for this year, but now I won't be too concerned if they don't flower.