University of Maryland Extension

June Lawn Tips

common dandelion

(More tips from HGIC)

  • Many types of summer annual and perennial weeds like Indian strawberry, clover, dandelion (see photo above), wild onion, and plantain are rapidly growing at this time. They can be controlled now with spot treatments of a liquid broadleaf herbicide. Early fall herbicide applications often produce better control, especially for difficult to control weeds like wild garlic, Canada thistle, and creeping Charlie.
  • Crabgrass has germinated. It is now too late to apply a pre-emergent herbicide. Small patches of crabgrass can be controlled during the growing season by pulling it out by hand or applying a post-emergent herbicide as a spot treatment.
  • Maintaining proper mower height of 3 inches is critical for a successful lawn and its survival throughout summer. After a wet period your grass may be excessively tall. In this case, mow your turf higher than normal, then return several days later and mow at the proper height.
  • Mow zoysia grass and Bermuda grass to a height of 3 inches. This is a height recommendation change for residential zoysia and Bermuda grass lawns. The taller height suppresses weed growth better than the shorter height that was recommended in the past.
  • June is a good time to (PDF) fertilize zoysiagrass; apply 0.9 lb. of nitrogen per 1,000 sq. ft.
  • Grasscycling (leaving grass clippings on your lawn), eliminates bagging labor, reduces costs, adds organic matter and nitrogen to your soil, and does not contribute to thatch build-up. Grasscycling provides about 25% of the nitrogen your lawn needs for the year.
  • Do not spray herbicides around ponds (fish are very sensitive to herbicides) or on breezy days and read and closely follow all label instructions.
  • Moss growing in a lawn is usually associated with low sunlight, compacted soils and low soil pH. Moss does not kill the grass but moves into areas where conditions are not good for the turf.  See (PDF) HG 100 Moss Control in Home Lawns.
  • Grub control products, acelepryn (Chlorantraniliprole) and imidacloprid, are best applied in July so as to avoid killing beneficial wasps that are active in June feeding on grubs. Follow all label instructions. These chemicals should only be used if you have a minimum average of 6-8 white grubs per square foot of soil and the grubs are killing your turf.
  • Moles feed on worms and grubs, they do not feed on plant roots but their raised surface tunnels can be a real nuisance in the lawn. Special traps for moles are the most effective method of control. Applying grub control products on your lawn usually does not control moles as they also feed on earthworms and other insects found in the soil. Refer to (PDF) HG 90 Control of Nuisance Wildlife for more information.
  • June is the beginning of the lawn disease season. Lawn diseases such as dollar spot, brown patch and red thread may be observed on turf at this time. No fungicide sprays are recommended. The management of these diseases is prevention/reduction by correcting cultural practices.
  • Close mowing and excessive fertilization can make lawns susceptible to some leaf spot diseases. Spring fertilization, as opposed to fall fertilization can also promote lawn diseases. 
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