Be sure to water them! Interior wall gardens are the newest home decorating fashion They are called "living walls," -- interior gardens of artfully arranged plants growing out of concealed trays or pockets anchored to a wall. They are seen in homes as a creative decorating alternative. Living walls don't have to cover an entire wall to be a stunning addition to a room. They could be much smaller, depending on the area to be emphasized. On large walls, the garden provides a dramatic focal point or a visual break that reflects the outdoors. It adds unexpected freshness and calming contrast as it turns a smooth wall into a textured linear design. Some decorators fill the pockets with kangaroo ferns and tropical plants. It you like the idea, interior designer Sarah Barnard of Santa Monica, California, suggests a living wall system made by Woolly Pocket Corp. The company's "Wally One" is a two-foot planter for $40; three units cost $100 and five cost $150. An area in a small New York restaurant has an 8-foot by 8-foot wall garden with 150 herbs and other fragrant plants that scent the dining area, according to The Wall Street Journal. Wall systems are often modular, with stackable cells of plants that can be arranged in customized displays. Irrigation is accomplished with an old-fashioned watering can or a computerized system on timers, which costs $60. One designer prefers the watering can method. She says people forget to set the timers on irrigation systems. The system could also develop a problem that could result in a flood, like a sticking valve. Rebecca Sweet, author of Garden Up, has a wall garden on a fence outside her home. It's a spot where it's difficult to plant anything on the ground. Bright Green in Hartford, Michigan, creates living walls from plastic trays of 10 or 45 cells. They hold plants at an angle and hand watering is required. The system retails for $29.95 for the small version or $39.95 for the large. A kit, including a wooden frame to set off the design on a wall, costs $95.