Mailbox Garden: Add big impact to a small 3-by-5-foot space with this long-blooming garden. It offers tough plants that stand up to the harsh growing conditions surrounding a street-side mailbox. The plants included here stay low, so they won't block the view while backing out of the driveway.
Place a sponge in the bottom of a planter before adding soil, to keep water in reserve. Really makes a difference in window boxes!