Water and Plants for Wet, Mesic, or Xeric Green Roofs
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n their own unique way, all things live in relation to water and sunlight (Patchett and Wilhelm 1999). This is a first principle for life on earth. Plants, living on green roof ecosystems, are no exception to this reality. Resilient green roofs are designed to be maintained with an agreeable pairing of vegetation with green roof substrates, sunlight, and water. Conversely, when there is a mismatch between a green roofs intended vegetation with the actual performance and movement of water through the green roof system, there can be unexpected and unfavorable outcomes. Vegetation can diminish, perish, and or become displaced or replaced with volunteer plants that prefer those conditions.
