Bermuda grass can grow quickly and more efficiently recover from winter dormancy if it is not overseeded. Bermuda grass can remain green until mid-November, at which time it becomes dormant. You can expect Bermuda grass to start actively growing
once the weather warms up sometime in mid-March.
Overseeding with ryegrass prevents Bermuda grass from completing its life cycle of storing energy prior to its winter dormancy. When temperatures begin to rise in the springtime, the Bermuda grass lacks energy and therefore has difficulty reestablishing itself.
When these two types of grass compete for resources, it may leave your summer lawn looking lackluster, especially after repeated winters of overseeding. Despite what is commonly cited, winter overseeding is NOT necessary for summer grass health, it is actually detrimental! A good example of not overseeding is Scottsdale's parks.
Spruce up your summer grass by evaluating it to make sure it is healthy and cared for (e.g., fertilized, aeriated). If there are areas with no grass or it’s patchy due to deep shade, consider removing the remaining grass and installing a topdressing such as compost or decomposed granite. Summer grass does not grow in deep shade.
But what about my pets?
Grass became popular in the mid-19th century; however, it really took off around the 1950s. We have loved our pets a lot longer than that! If you provide grass, they usually use it, and if you let the Bermuda grass follow its life-cycle seasons the pets will continue to use it. We know some pets may not like change, so consider selecting a smaller area for winter grass or try a new routine, like taking them for walks or to the park. Pets will love the walks and you both will be doing your part to save water!
Selectively Overseeding
Overseeding does not have to be an all-or-nothing proposition. Winter overseeding can be limited to high-traffic recreational, high-visibility and/or pet areas while allowing low-use areas to become dormant, like your front yard.
Never overseed non-functional grass. Non-functional grass is grass that is ornamental and serves no public or recreational function. Non-functional grass areas are prime candidates for Scottsdale's grass removal rebate programs.
Homeowners’ association (HOA) members are encouraged to review Ordinance No. 4567 of Scottsdale’s Code of Ordinances. Updated in 2022, this ordinance prohibits HOAs from requiring its members to over-seed for a winter lawn.
How Much to Water?
The Landscape Watering by the Numbers guide will help you with water efficiency and if you overseed, review resources from the U of A Cooperative Extension on timing and appropriate overseeding procedures.