Good Day to you all!

I came across this plant a while back in April while I was walking my dog.
I thought the color of the plant was quite unique:
The stem was sort of burgundy in color, the tip of the plant where the flowers sprung looks similar to a Lavender but still burgundy in color.
Then I noticed that it has flowers (a bunch of them together like a hydrangea) on it which looked like a shade of lilac and pink.

I really love the aesthetic of this plant and was wondering if you could help me identify it.

I live in Southern California.

I'm guessing that this is a wild plant.
I came across a photo of it online and its the only photo i have. I cant search for more since I have no clue on what the name is.

Verbena bonariensis

Edit : forget to say hi, and welcome. Hehehe

Here's a link to our database entry with lots more images of this plant.
Tall Verbena (Verbena bonariensis)

Although your description of burgundy in stems doesn't match. But that image you added is Verbena bonariensis

This is what the entire plant looks like.

Hi & welcome! V. bonariensis is not native in the US.

This annual self-sows freely. You will have a bounty and will need to thin these if they decide they like your place.