Can anyone identify this plant?

in Plants
I saw this in a magazine and they have put it underneath an Olive standard. I have 2 Olive standards and are bare underneath. Really love the idea on this page. But doesn’t tell me what the plant is.
Many thanks for for your help.
Many thanks for for your help.

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I grow them and they flower from May/June until the frosts
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.