Yes - probably too dry as @Buttercupdays says. Mildew is a sign of that. My white Astrantia [superstar ] is at least a metre tall. If the site's dry, Agastaches and Veronicas are certainly a great suggestion. Any of the 'daisy' plants would be good too - Heleniums etc. Depends on what colours you like as well.
Thanks. Are the plants salvageable now they’ve got mildew or should I cut them down and replace with some of the suggested plants?
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I live in west central Scotland - not where that photo is...