Dahlias. But you can find mums in that color as well.

Gorgeous. Can you grow either in Socal?

Dahlias for sure. Mums prefer a period of winter cold/dormancy but are frequently sold as seasonal "annuals" for a spot of late fall color.

Baby, bedding type dahlias sold as blooming plants in season produce flower heads of that shape. Ask what time of year your favorite outlet may have these, in your climate area. Otherwise you will be able to find dahlia tubers on the web, in print catalogs, or at garden shows. With the selections from bulb dealers - in particular dahlia specialists - being much greater than at any one garden center.

Keeping in mind that only the aforementioned dwarf kinds produce small, compact plants comparatively easily managed in decorative displays. With all other types being larger and more open growing, requiring staking and so on. And tending therefore to be lined out in dedicated, utilitarian looking beds or fields of their own.