Many people in the Twin Cities area are experiencing lawns flooded by heavy rains or the overflow from streams, rivers and lakes. The University of Minnesota Extension Service warns that during periods of high temperatures and sunlight in the summer, water that ponds on a lawn can cause significant damage or loss even within a few hours.
The damage occurs if the temperature of pooling water on the lawn is 80° F. Turfgrass death occurs in only a few days when this happens. The turf can still die even when water temperatures are lower because the water prevents oxygen from being available for the grass.
Other damage that can occur includes:
- sediment buildup
- fungal diseases
- moss and algae
- weed infestation
Minor flooding may be an indication that your lawn has drainage issues. LUNSETH’s landscaping crews’ have assessed and addressed this issue for a number of homeowners. Changing a lawns slopes and valleys can prevent flooding issues in the future.
The Extension Service goes on to warn that, in some instances, you may have to wait for a fix. The grasses we typically grow in Minnesota do not establish well in the middle of the summer due to the high heat and diseases that may occur. For instance, LUNSETH recommends waiting to seed until temperatures cool in the early fall (mid-August through early October).
Sediment buildup is likely following flooding and may result in needing to re-establish a lawn when silt has completely covered it. The process the Extension Service recommends includes:
- aerate in the fall
- overseed after aerating
- sodding can be done throughout the growing season
If you’re worried that your lawn has been damaged from too much rain or flooding, Organic Lawns by LUNSETH has the expertise to assess the problem and help you get your yard thriving again.