Blue bushes, Caryopteris

These bushes were really unnoticeable untill they came in bloom: pale blue. There are three of them, on either side of the lawn. I think that I need to trim them back in spring: they look trimmed before.

Cat's tail? Purple Loosestrife

I am not really sure about the name of this, cat's tail? The dictionary gives as translation Purple Loosestrife. But I am not even really sure I have determined the plant well.

But it lights up really nice in the evening light. And I would really like more of this next year. Does it sow itself? I have several varieties in the garden of what appears to be cat's tail, but they are quite different. How does that work?