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What can I plant here?

Photo was taken earlier in spring.
I need something to plant where the two red x's are. It will be for next year now I should think.
The soil is improved clay, it gets plenty of sun.
So the left one, it would be underplanting for Harlow Carr roses. Currently there is osteospermum, but it was mislabelled and is orange and yellow. I hate them! They were supposed to be white and purple but even in those colours I don't think they would have looked right. I was thinking shrubby salvia but not sure what colour to go for. Not all of them grow too big but I can extend outwards a bit for a good choice if necessary.
The right one is currently Helianthemum, but it's yellow and clashes badly with the viburnum kilimanjaro above, which is white vut tinged pink as the flowers develop and again as they fade. It also seems to harbour millions of slugs 😭I'd like something else but not sure what. Open to any ideas here.
Greatful for any ideas.

I need something to plant where the two red x's are. It will be for next year now I should think.
The soil is improved clay, it gets plenty of sun.
So the left one, it would be underplanting for Harlow Carr roses. Currently there is osteospermum, but it was mislabelled and is orange and yellow. I hate them! They were supposed to be white and purple but even in those colours I don't think they would have looked right. I was thinking shrubby salvia but not sure what colour to go for. Not all of them grow too big but I can extend outwards a bit for a good choice if necessary.
The right one is currently Helianthemum, but it's yellow and clashes badly with the viburnum kilimanjaro above, which is white vut tinged pink as the flowers develop and again as they fade. It also seems to harbour millions of slugs 😭I'd like something else but not sure what. Open to any ideas here.
Greatful for any ideas.

Slowly building a wildlife garden, in a new build in East Yorkshire.
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Posts
An evergreen campanula wiil be fine in your soil C Portenschlagiana can get away a little
too fast in some soils but fine on clay.
I'm not sure there'll be much room on the left if you plan on having roses in there, or is that them already in place? You'd need to make the space bigger to give other plants a chance if they're varieties which spread a good bit.
I'd agree with @GardenerSuze about colours. Liatris would give you some height [purples and whites] across the site. Getting a succession of colour and flowering is the best method, so verticals are useful in a small site where there's already shrubs etc, and the liatris will do that.
The perennial candytuft -Iberis, will grow on the right hand side. It isn't fussy about sun or shade, or moister clay soil, and is evergreen. You should be able to put bulbs in with it too. It spreads and provides good groundcover.
Sedum spectabile [now called Hylotelephium] will also be fine on the left side if the drainage is ok. Hardy geraniums will also be fine - hundreds to choose from, and are great with spring bulbs - always a reliable combination.
I live in west central Scotland - not where that photo is...
I know why you struggle with herbaceous plants they can dry right out in summer and without constant watering perform poorly. Nothing to see in winter either until they emerge then salvias like S Caradonna get eaten.
If you plant the evergreen campanula[you will need to lift and split over time to form a carpet] in front of the rose they will compliment each other through the summer. You could add some white cosmos a filler year one, flowers do have yellow centres.
The sedum mentioned by @Fairygirl has good autumn colour too but you will need good winter drainage your helianthemum has done well so that is good indication.Liatris as mentioned should give you some height which is difficult considering what you want to achieve. A white Japanese Anemone would work with Liatris if you have more space.
In early spring the Iberis would be the main focus some early purple crocus might compliment. I would add carpet of the evergreen Ophiopogon planiscarphus nigresiens but that is personal taste.
You mention woody salvia I have managed to get S greggi Blue Note through the winter. It may depend on where you live but many woody salvias didn't make it through last winter.
Long term you will have a border dominated by a shrub and roses in order to keep a balance you will need to make changes in what is a small space.
The roses were newly planted from bare root this winter. They will grow much taller than shown here so I'm not too worried about height I don't think?
I like the look of the Liatris, that might be worth a go.
I do have Campanula elsewhere in the garden but it's constantly ravaged by slugs! They eat everything here, that's why I tend to stick to shrubs. They're even munching their way through my pulmonaria which I wouldn't have thought they'd like??
Iberis might work well too. I've not heard of Ophiopogon planiscarphus nigresiens so I'll look that up, thanks.
I thought salvia as they seem to do well here. I have hot lips, blue monrovia and nachtvlinder already elsewhere, they all do well.
I was just puzzled that salvias do well in these conditions. Slugs and snails would indicate a wetter soil?
It's wet in winter, it's clay soil obviously (with lots of builders rubble 😡) but I do work hard to improve it. It drys out in summer and the salvias are all in the south facing border. I've never lost one even in last year's awful winter.Roses do really well here too. But yeah, loads of slugs eating things they shouldn't eat, like Campanula, pulmonaria, even my Thyme! I go out and dispatch them but more keep coming.
Ooh I do like an evergreen geranium, I have quite a bit of wargrave pink. I'll have a look at dalmaticum and the allium too, thank you.
However- the Scottish bluebell - the harebell, is one they leave alone, and the only one I grow [for a different reason ] Campanula rotundifolia. Worth trying.
If you can grow salvias without having to overwinter them, they could be useful if it's sunny enough then. Alliums would give height, and there are many types to give a succession of flowering. Veronicas too if you can grow salvias easily.
Clay needs lots of amending for it to do the best job, otherwise many plants will struggle because of those extremes though. Slugs will have a go at most plants, as will those tiny snails, which are often the worst offenders.
It's why I don't grow a lot of the things many other people grow, and I have the same problem as many others don't garden to any great extent here.
Aquilegias are another plant which will give height and aren't fussy with soil
I live in west central Scotland - not where that photo is...
The Allium I mentioned is a shorter one just opening it's flowers now. Lovely nodding at the edge of a border.
@Fairygirl Interesting you mention C rotundifolia I saw it at a GC a few weeks ago and took a photograph of the label with a view to mentioning it on here. Does it fall over or does it need staking.