Marigold
Orange, yellow, white, mahogany, maroon, or creamy yellow flowers; grows 6 to 36 inches high; prefers full sun or afternoon shade in hot areas and well-drained soil; hardy to +10 degrees F
Stonecrop
Small perennial with clumped pink buds that bloom in summer; grows 2 to 4 inches; likes full sun; dry soil; hardy to -20 degrees F
Rosemary
Highly aromatic with pine-needlelike leaves; grows to 5 feet tall; prefers full sun and well-drained soil; hardy to 10 degrees F
Choosing plants that are drought resistant can mean easier care through out the summer months. That week at the shore won't be as painful when you return.
Be Green-
The Eco Agent