Wanted : white flowering poss. annual to fill a patch BUT must be snail proof!

[erebus]

I have a small semicircular bed against the house wall (we are talking 1m across). There's a Pieris in the middle against the wall and 10 or so small box plants around the edge. Whole thing's been in 2 years so I have a bare strip around the Pieris. I put in some white petunias but within days they were stripped bare.

I won't put snail and slug poison down as we have a lot of birds- what preferably white flowering annuals or even perennials could I put there for colour now?

TIA

Don't know if it is any use but have you tried nemaslug - I get awful slugs and snails and this stuff was fab last year at keeping them away, and safe for birds, pets, children

some info here

www.greengardener.co.uk/product.asp?id_pc=22&cat=35

have seen some white begonias in stock recently that should work, don't think slugs like them too much.

Thanks all!