Prostrate Rosemary. I have planted some of this as groundcover. I don't intend on letting it get this bushy though. Prostrate Rosemary, Rosmarinus Officinalis, Magnolias Gardens, Front Yards, Yards Gardens, Gardens Nurseries, Trail Rosemary, Creeping Rosemary, Officinalis Prostratus
Flattop Buckwheat BUSH/ Eriogonum fasciculatum v. polifolium/ Mature Size: 1' h x 2' w/ Flower Color: Pale pink to white/ Sun: full sun/ Flower Season: spring/ Water: very low/ Growth Rate: fast/ Form: rounded/ Evergreen? evergreen/ Hardiness: 11-20° F/ Litter: low/ Attracts Wildlife: birds/ Other Features: Suited to small spaces.
You can grow an olive tree in a concrete planter on a deck. They're really hardy, don't mind heat generated by their pot and don't require insects to pollinate them. I've had one for 16 years in a terracotta pot and although the pot keeps it small, it still rewards me with enough olives to brine for my pantry.