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Buddleia I think

Maybe it's some form of that. Not sure.

Me neither!

!LOL

Google Lens says it's some sort of Veronica. It comes up every year.

What's a three-season bed?
One without a spring.

Credit: reddit
$LOLZ on behalf of nicklewis

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This flower made me remember purple hibiscus
They don’t look alike but the color
Lilac

Definitely not that one. It has lots of tiny flowers.

Maybe Culver's Root?

I think the same. Siberian Culver Root (Veronicastrum sibiricum).

It looks very similar, if not the same.

But I am not sure. Maybe something else.