Lots of different ways based on color, texture, height, and leaf sizes.

Why is this lamp-post so important to be framed like this?

How about one of the red Japanese maples? But I don't think you want it symmetrical on either side of the post. Do you have a photo?

If you don't try to get geometric symmetry like this then you don't have such a brittle situation, where everything has to be perfectly matched. And this is only called for when everything in the scene, including the architecture of the dominant building is geometrically symmetric. Otherwise a conflict is produced, as with a tuxedo at a picnic.

But maybe you are working in a formal setting. You didn't say.