Over seed rye

Helpful? Doubtful.

Downsides - several. Below is an AI summary, but these “negatives” were discussed by Bert Hammett, LSUAgCenter EBR parish extension specialist at a Master Gardener seminar I attended several months ago. He was of the opinion these “negatives” outweigh the “positive” aesthetics.

The main downside of overseeding St. Augustine grass with ryegrass is that the cool-season grass competes for water and nutrients in the spring, which delays and weakens the green-up of your dormant St. Augustine lawn.

According to turf management guidelines from sources like the LSU AgCenter, here are the specific disadvantages of overseeding St. Augustine with ryegrass.

• Spring Competition: Ryegrass often lingers well into May or early summer, competing heavily with the underlying St. Augustine grass just as it tries to break dormancy.

• Delayed Green-Up: A warm-season lawn that has been overseeded takes significantly longer to recover, green up, and look lush in the spring.

• St. Augustine Stress: St. Augustine has a coarser texture and is more susceptible to root stress and competition from heavy ryegrass stands—especially if your lawn is in shaded areas.

Plus I’ll add if you have significant winter weed issues that you want to control using a pre-emergent herbicide, the herbicide is typically applied before planting rye grass seed, which will prevent its germination.

Bert mentioned as an extension agent he commonly observes St Augustine decline in lawns in Baton Rouge that annually overseed with ryegrass - after a few years. I noticed the same with few neighbors, who learned the hard way, and no longer do it.

Of course, over seeding a bare dirt area during winter makes sense and is perfectly fine.

Your call…….

quote:

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Other than aesthetics, is over seeding St Aug for winter helpful?

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It does look damn good, but you will catch hell in the spring when it starts growing again. You’ll be mowing twice a week before it dies,