The best window planter from China Forefront

Window planter is a container filled with plants, which normally rests on a windowsill but can be attached as well to the building below the window. 

A window planter gives people the possibility of having a small garden in a confined area, when they have no other areas to plant, for very little expert knowledge and effort. It has been traditional in Britain and Europe in general to have billowing and floriferous window planter cascading with plants adorning apartment windows, houses, storefronts, restaurants, and even service stations.
The average window planter is 36 inches (90 cm) long, 8 inches (20 cm) high, and 8 inches wide, but it can be made or bought to fit the actual size of your window ledge. The box should not exceed 4 feet (1.2 meters), as it would become unwieldy and dangerous otherwise. It can be made from different rot-resistant woods such as redwood, cedar, teakwood, clean pine (without knots), or plywood treated with a noncreosote wood preservative that will not harm the plants by leaching into the soil. Other possibilities include cast stone, lead, concrete, terra-cotta, fiberglass, plastic, or metal. The last two, however, are not always the best choices as they tend to heat up.