What defines marsh vegetation in terms of soil organic material?

Marsh vegetation is typically associated with higher levels of soil organic material, and the presence of more than 10 inches of organic material in the soil is a clear indicator of marshland. This significant accumulation of organic matter occurs due to the anaerobic conditions prevalent in marsh environments, which slow down decomposition and promote the accumulation of plant material. Therefore, when assessing marshes, identifying soil with over 10 inches of organic material helps distinguish these ecosystems from other types of wetlands or uplands where organic matter levels may be lower. Such conditions support the growth of specific marsh plants that thrive in this rich organic environment.