erigeron isn't evergreen in my garden but it tends to be green in the dead of winter and then it starts to die off about now, when the spring bulbs are coming up.
erysimum are evergreen and drought tolerant and flower more or less all year. Bowles Mauve would be too big but there are smaller and prettier ones. I've got apricot twist.
dianthus 'arctic fire' has been doing well here for a few years now, reliably evergreen but we've not had any drought to speak of in that time.
helianthemum would be another possibility - evergreen and pretty happy in dry places.
Gardening on the edge of Exmoor, in Devon
“It's still magic even if you know how it's done.”
I only grow pink dianthuses (bright pink and one which is very light pink, almost cream), so no recommendation from personal experience for white ones. Deltoides is lovely but small and alpine-looking. If you want something a little bit fancier and taller, maybe try something like 'Mrs Siskin', it seems to be sold and recommended by many sellers. Scabious 'Butterfly Blue' is evergreen for me to but when I google it, it's listed everywhere as deciduos. Weird.
Like dianthus deltoides 'alba'? I have a shocking pink one of those. Love it. Grows nice and fast too. A 9cm pot quadrupled in size within a year and survived a more northern winter than London.
Convulvus cneoreum/silvery bindweed is a drought tolerant evergreen I was thinking of. Mine has come through winter fine.
Similarly my sciabiosa 'butterfly blue' is flowering now! Evergreen and will still be flowering later than other perrenials.
@delksi my scabiosa is also flowering now!!! Most unexpected! I wondered if that meant it would exhaust itself before spring is over but your post has given me hope!
To update you, after a long hunt, for a very specific spot, I have settled on campanula port 'Mrs Resholt' - Chelsea winner, more or less evergreen, flowers through the summer, mat forming. Fingers crossed it likes the plot. It should be good protection against the movements of cats and foxes.
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erysimum are evergreen and drought tolerant and flower more or less all year. Bowles Mauve would be too big but there are smaller and prettier ones. I've got apricot twist.
dianthus 'arctic fire' has been doing well here for a few years now, reliably evergreen but we've not had any drought to speak of in that time.
helianthemum would be another possibility - evergreen and pretty happy in dry places.
“It's still magic even if you know how it's done.”
Scabious 'Butterfly Blue' is evergreen for me to but when I google it, it's listed everywhere as deciduos. Weird.