The idea is to control the weeds, but not harm the grass. Others have asked about using a non-selective product such as Round-up on zoysiagrass and bermudagrass when the grass is dormant in winter. Using Non-Selective Herbicides on Dormant Zoysia In turf studies, injury to zoysia grass occurred when rates heavier than recommended were applied. Do not exceed the recommended rates of application. Preen uses trifluralin and is great for broadleaf weeds in gardens and lawn.ĭimension, Barricade, Halts and other brands are not as good on broadleaf weed seeds, but do a good job against crabgrass. Spring weeds germinate in the fall, but are most obvious to us in the spring.Ī good preemergent such as Gallery is good for broadleaf weeds.
This means for cool season weeds (weeds you see in spring) it must be applied in the fall before they germinate. The preemergent must be applied before the weed seeds germinate. One thing you can do to help keep spring weeds down is to use a preemergent. You may need to delay the application for another week if the grass is just beginning to green up just to be safe. Companies that use liquid fertilizers will usually mix a herbicide with the fertilizer so you get both in one application. If a lawn care company takes care of your lawn, make sure you ask them what they are using. Augustinegrass have herbicide restrictions as well. Read the label carefully.Īlthough I practice spot spraying using liquid herbicides, I would think the granular weed and feed products would merit the same concern. After that period, 2,4-D can be used again. There is a week to ten day period when zoysia grass is just beginning to break dormancy that 2,4-D weed killer can harm it.
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