If it helps to have visuals, here is New Gold interplanted with the Trailing Lavender Lantana. You can see the Mexican Feather Grass at the front corners. Might look at Green Santolina, too, for your garden. Never cared for the silver foliage with those funky yellow blooms on the standard Santolina. This one is bright green and the blooms are cream/ivory, although you can't tell in the composite photo because the blooms are spent. Need to deadhead them only because I like the neater look. This second photograph is from May.
And New Gold at the end of the driveway bed. Been there four or five years. All this from just two plants, side by side, and they produce an abundance of beauty every year.