Rooftops can be challenging places for plants to thrive. Direct sunlight, extreme temperatures, wind, and precipitation affect which plants survive on a green roof, so plants should be selected to withstand harsh environments. 

Extensive green roofs are comprised of sedum or groundcover. Deeper semi-intensive and intensive green roof systems can support native plants, wild grasses, shrubs, and even trees, though they require more maintenance than simpler extensive green roofs.