If the 10-day forecasts are correct, the winter thaw we’ve all been waiting for is about to begin this weekend.

Winter thaw: the most common time “nonpoint” or “runoff” phosphorus pollution enters lakes and streams.

 
As managers of landscapes, we need to keep in mind that:

• Sediment is the primary source of phosphorus (large quantities of phosphorus are attached to sediment)
• Most phosphorus runoff from turfgrass comes during winter
• Improving soil quality is one of the most effective way to reduce nutrient losses from urban areas
• Dense ground cover is good for the urban environment

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Recently, surface soil temperatures have been dropping below 70° F at night. While this is a good temperature range for growth of cool season grasses, it is a signal that much cooler soils are not far away. Grow of new seedings, overseedings, and turfs needing recovery will slow dramatically once soil temperatures break below the 60° F threshold. We have reached the time (October 1) where we no longer recommend seeding of most grasses except perennial ryegrass. Perennial ryegrass can be seeded as late as October 15 and still have high probability of develop a stand of turf.

Cool weather limits the establishment of new seedings. In this photo,
poor seed to soil contact will also inhibit establishment of new turf.