The landscaping in their backyard is professionally designed and looks beautiful.

landscaping 是由名词 landscape（景观、风景）加上动词后缀 -ing 构成的动名词形式。land 表示"土地"，scape 来自古英语，表示"形状、外观"。landscaping 指"对土地进行美化设计的工作或结果"，即"园艺景观设计"。