Turk's cap does really well here.

Plumbago is pretty an can fill in the open space very quickly.

How about Salvia greggii and/or Lantana ? Both come in several colors, sizes, and plant forms.

Jasmines, roses and brugmansia's are my best fragrant plants, but don't always do well in the summer heat.

With the beautiful color of your stone, I'd go with a red or pink rose. Belinda's Dream is a good pink one.

Where are you and what kind of soil are we talking about?

A said above texas sage bush. Lantana i think i see one in your pic.

Snap dragons

Geraniums

Petunias

Ive seen all these grow here. I have sage, pride of Barbados, lavender, zinnias, roses, hibiscus, geraniums, daisies snapdragons. Ice plants, alyssum.

I live in el paso. Zone 8a