Posted: 17/02/2015 at 16:00
I have some digitalis seeds which flower a creamy white and the plant is perennial and multi stemmed. If you want to try it pm me. I can't guarantee you'll have flowers but if you start now you might have some ready in time.
Don't forget that you could still buy 3-4 bunches of white flowers and then have a couple of each spaced out in your table decorations, add your greenery and then any more flowers.
I was going to suggest white cosmos like Topbird and you could also try cleome, aquilegia, agapanthus, scabious, verbascum, ammi majus, nigella
And checkout Gardengirls recommendation as there are also seedlings and plants available.
Don't forget to check out places like B&Q, they always have a reduced rack tucked away and you may find some bargains.