Flood Information

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Flooding Affects on Soil and Plant Roots

When soils are completely flooded, oxygen is prevented from reaching the root system of trees and shrubs
  • Some are more tolerant of waterlogged conditions, but the longer the lack of aeration, the greater the chance of root death.
  • Most landscape plants can survive being submerged for about a week. However, extended lack of aeration to the roots will result in root die-back, with the above-ground symptoms appearing as leaf yellowing, droopy foliage, leaf drop and, eventually, branch die-back.
  • Waterlogged root systems also are more susceptible to attack by root-rot organisms.
  • In areas of severe flooding, concerns for plant health also include soil erosion and deposits of additional soil and silt. Both can damage the root system
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