The term 'DECORATIVE GREENERY' can be broken down into two parts: 'DECORATIVE' and 'GREENERY'. The crossword solution for the term is 'Ferns', which are a type of plant that have been used as DECORATIVE GREENERY for centuries. Ferns are known for their lush, green foliage and are often used to add a touch of natural beauty to any space. They are also low-maintenance and require minimal care, making them an ideal choice for those looking to add some GREENERY to their home or office.