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MONTHLY CARE GUIDES

May Lawn Care Guidelines for Oklahoma

Insect Alert:

  1. Bagworms on juniper and arborvitae. (Late May)
  2. Elm leaf beetles and larvae on elms and zelkova. (Late May)
  3. Mimosa webworms on mimosa and honeylocust.
  4. Lace bugs on sycamore, pyrancantha, and azalea.
  • Pine needle disease treatments are needed in mid-May.

  • Cool-season lawns can be fertilized again. If you did not fertilize cool-season grasses in March and April, do so now.

  • Warm-season lawns may be fertilized again in May.

  • Seeding of warm-season grasses such as bermudagrass, buffalograss, zoysiagrass, and centipedegrass is best performed in mid-May through the end of June. Soil temperatures are warm enough for germination and an adequate growing season is present to promote winter hardiness.

  • Dollar spot disease of lawns can first become visible in mid-May. Make certain fertilizer applications have been adequate before ever applying a fungicide.

  • Nutsedge plants become visible during this month. Postemergent treatments are best applied for the first time this month.

  • Make certain warm-season grasses have completed green-up.

  • The second application of pre-emergent annual grass herbicides can be applied in late-May or early June depending upon timing of first application. Check label for details.

  • Vegetative establishment of warm-season grasses can continue.

  • Annual bedding plants can be set out for summer color.

  • Soak new transplants and newly planted trees unless rainfall is abundant.

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