Each of the WELL Building Standard’s seven design conditions require plants to fulfill the biophilia requirement present in the certification process.  For example, placing plants and greenery covering a minimum of one percent of the building’s floor area per floor is part of the requirements. Also, installing a living wall, which either covers the largest available single wall, or multiple living walls with one per each building floor, meets the certification guidelines. Plants can be incorporated in a prominent way in the interior design, or added for subtler effects.