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Grassy Weeds in Your Bermuda or Zoysia Lawn

April 11, 2017

Grasses that stay green all winter can really stand out this time of year when they are growing in mostly brown Bermuda or Zoysia lawns.  These grasses are either annual grass, that lives less than a year and then grows back from seed OR perennial grass that lives longer than a single year.

Here are 4 photos of grassy weeds to help you figure out if you are dealing with an annual grassy weed or a perennial grassy weed problem.

This is an early spring picture of the annual grass Poa Annua in a Bermudagrass lawn. Notice the light colored seeds. (Click photo to enlarge)

This is perennial Kentucky Bluegrass in a dormant Zoysia lawn. (click photo to enlarge)

This perennial Tall Fescue in a dormant zoysia lawn. (click photo to enlarge)

This perennial grass in a dormant zoysia lawn. (click photo to enlarge)

What to do about annual grassy weeds?

Poa Annua (Annual Bluegrass) is the most common annual grassy weed and is very obvious now along with other “winter annuals” like Chickweed and Henbit.  To stop these winter annual weeds from invading your lawn next winter, you can treat your lawn next Labor Day weekend with Scotts Halts or Scotts Turf Builder with Halts.  (You apply these same products in early spring to prevent crabgrass and other summer annual weeds.  When you apply this product in early fall it helps prevent Poa Annua and other winter annual weeds.)

What to do about perennial grassy weeds?

There are not any weed controls that will kill the perennial grassy weeds without harming your Bermuda or Zoysia grass.  One way to deal with these problems is to dig out individual clumps of these grasses when they are so obviously visible in your dormant lawn.  This could be a good option if you only have a few clumps.  There is a particular Roundup product that makes it easier to treat individual weeds and grasses that are growing near plants that you do not want to touch with Roundup.  Here is a link to more info about Roundup Gel.  If you go this route, you will need to be careful not to get the Roundup on the surrounding good grasses even if they are dormant.  This may be a little bit easier to pull off if the grassy weeds are growing taller than the good grass as shown in these photos.

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