We've always just done plain, old fashioned, white petunias.

Oh yea, that's right - petunias!

Euphorbia or lobelia?

My choice would be Euphorbia 'Diamond Frost'

White ’wave’ petunias….for your spiller and self cleaning a big plus!

Euphorbia 'Diamond Frost'…I wish I could tolerate the smell of these as I love the look.

" Euphorbia 'Diamond Frost'…I wish I could tolerate the smell of these as I love the look. "

??? They have absolutely no scent that I can detect. Euphorbias are not known for having a discernable aroma..........

Too hot here for lobelia -- they poop out. I've never grown Euphorbia, I'll have to look into that.

My choice would be Euphorbia 'Diamond Frost'

Hey 'gg', I know you have suggested this plant in the past. I am glad you mentioned it again as I have now made a note to try it this coming season.

Bacopa, white nemesia, gypsophila repens or white begonias. Long flowering (especially bacopa), easy from seed, need no deadheading.

O, and candytuft as well as little perennials such as arabis, arenaria and matthiola incana ]'Alba'and my favourite short white evergreen - parahebe catarractae 'Avalanche' - an absolute delight which will flower the whole season.

I love candytuft also @rosaprimula UK (Cambridge) Z8/9...the brightest white there is IMO but I dont think it is the best choice for a summer container as in my neck of the woods it is done flowering by June something.

Yah, true, Rouge. There is a big difference between the semi-tender plants we grow as annuals (petunias et al) for container work and the true, unimproved annuals such as ammi, centaurea, linum, convolvulous, which I treat almost exactly the same as vegetables, doing direct, successional sowings around the allotment. I am a bit rubbish at planting seasonal containers (mine tend to have permanent perennials which get shunted around the garden and stashed out of sight when looking less than stellar ) so I think quite a few of my suggestions need to be taken with a large pinch of salt.

mine tend to have permanent perennials which get shunted around the garden

This describes me more and more the past few years. I enjoy lots having perennials in a pot but it can be a bit of a crapshoot as to whether or not they will overwinter in their containers in the garage (this past week we experienced outdoor temps from -15C to -18C so "fingers crossed")

('rosa', I always wait with bated breath for your clever, informative posts)

I've had great luck with white alyssum in my pots - a late summer shearing revives them if needed.

I haven't tried this one yet, but there's a white zahara zinnia. They're 8 to 10" tall and bloom nonstop. Zahara zinnias are my top-performing container plant and they're a snap to grow from seed.

Diamond Frost Euphorbia is beautiful with anything!

Very pretty @gawdinfever...thanks for the pictures as I do like seeing "real world" containers.

So what about Gaura? Not short, but the foliage is. The flowers could be dancing with whatever you grow.

I also pick Diamond Frost Euphorbia-simply wonderful.

White alyssum is a close second

Ooooh, I found more photos of mini vista white supertunias on Facebook!! I‘m going to be on the lookout for this one myself this year.

My choice would be Euphorbia 'Diamond Frost'

@gardengal48 (PNW Z8/9) I did follow through with your suggestion, incorporating a Euphorbia into a container.

("Diamond Frost", a salvia and a geranium)

Rouge, your containers are always so attractive and photogenic!!

I love how dainty and delicate the white euphorbia flowers are against the darker foliage. It still remains one of my favorites 'filler' plants.

I love the quality advice I get in this and the perennial forum. Thanks as always 'gg' (et al).

White stocks, also phlox (rhyming not intentional!).

I started a lot of white lobelia from seed and they've been blooming non stop!

Also euphorbia ”Diamond Frost” unfortunately it is increasingly difficult to find. Theres a ”blush” version which is a clumper not a trailer so read the tag carefully. if you see ”diamond frost” earlyin season, jump and buy it because they dont seem to be growing it in quantity.