Preemergent herbicides for crabgrass prevention in lawns
Preemergent herbicides are most effective at controlling annual grassy weeds like crabgrass, foxtail, goose grass, and barnyard grass.
Apply preemergent herbicides between the middle of March and the middle of April to control crabgrass.
Finally, you need to decide whether you want to apply a preemergent herbicide to control winter and spring weeds.
Preemergent herbicides are placed in or on the soil to deter weed seed germination. Postemergent herbicides are sprayed directly on the growing weed.
-- is a natural fertilizer and preemergent herbicide available in liquid and granular form under several brand names. It contains about 10% nitrogen by weight.
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- In the southern Midwest, if you have a lawn with warm-season grasses, such as Bermudagrass and zoysia, fertilize and apply a preemergent herbicide at the end of the month.
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Fruit trees, landscape trees and some shrubs may benefit from a dormant oil application before they leaf out. Overwintering scale, aphids and mites are pests that may be controlled. In early spring apply preemergent herbicides for grassy weed ...
 See also: Plant, Fertilize, Herbicide, Care, Water
  
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