SteveM - it was the tax thing that Adam D mentioned earlier in the thread. Utiltarian glassware attracted a lower tax than fancy glass for frivolous uses such as floral decoration! So, if the "vase" is of a shape that could hold a head of celery, then the factory could call it a vase and it wouldn't attract as much tax.
Frank - you can stand down - Gareth's just teasing :lol:
Gareth - we could always go the classy French way and call them Coupe lave-raisins.
And on a final note of interest - the Curved Star celery which is shown in the Brockwitz catalogue as a celery (traubenspuler etc etc) is also shown on the Blumenvase section as a Flower vase. If you offer a dual use then you'll sell more!