This is the site the photo comes from. Says under the photo what is in it:

https://www.houseandgarden.co.uk/gallery/clare-foster-garden-berkshire?utm_source=Facebook&utm_medium=Social&utm_campaign=SocialFlow&fbclid=IwAR1APlQTqUj_DHwn6wSxQdPMb5trq3a9bylaDRus_bBt2l5KkJWCvEdVv2k

I swear I see a blue geranium in the lower foreground LOL.

The article mentions some of the plants but names lots which are not in the picture. And doesn't mention some which are.

The pink is indeed a Penstemon

There is a blue/purple Salvia nemorosa. And yes, there is a Geranium. The tall narrow white spires are the Verbascum chaixii ‘Album’ mentioned in the piece.

I'm not seeing any Yarrow or Babys Breath. The Scabiosa ochroleuca is perhaps what you're thinking is Yarrow.

Thank you so much!

the grass is Stipa gigantea, the Gladiolus look like Gladiolus byzantinus (Old House Gardens has true stock of the latter) which I have been growing in Zone 5 in free-draining soil

That's not Gladiolus byzantines, it's a Penstemon. Look at the leaves if the flowers aren't in sufficient focus. Did you click on the picture? It will resolve to better quality.

From the article:

This large, curving border in our garden editor Clare Foster's garden was created from scratch in spring 2018. With the help of her family, Clare dug over the border, enriched the soil with compost and planted it with a mixture of grasses and herbaceous plants, carefully chosen to ensure interest in each season. Shown here in July, it includes magenta Penstemon ‘Garnet’, pale Scabiosa ochroleuca and tall spires of Verbascum chaixii ‘Album’ in a haze of Stipa gigantea.