Grassy Perennials

• Grassy weeds are monocot plants, meaning that they emerge from germination with one leaf. Quackgrass, tall fescue, creeping bentgrass, bluegrass and bromegrass are examples of monocot perennial weeds. Bluegrass grows as an annual, biennial or perennial weed. Perennial grassy weeds are controlled by increasing mower height. Leaving the grass bit longer at mowing improves lawn turf's health and ability to compete with weeds. Conditions associated with grassy perennial weeds are overcompaction and overwatering.
  
  

Grassy Annuals

• Crabgrass, goosegrass, barnyard grass and foxtails are monocot, annual, grassy weeds. Crabgrass is either the low-growing, smooth-leafed variety or the kind that is tall with hairy leaves. Annual weeds grow, set seed and die within one growing season. Conditions associated with the growth of annual grassy weeds are soil compaction, light watering and mowing too short. Reducing irrigation reduces grassy annuals' growth. Lawns that are aerated have reduced weed growth.
  
  

Broadleaf Perennials

• Dandelion, white clover, creeping wood sorrel, English daisy, plantains, dock, purslane, thistle, chickweed, mallow, and yarrow are classified as dicot, broadleaf, perennial weeds. Control broadleaf perennial weeds by removing them before they spread. Turf grass competes more successfully with broadleaf, perennial weeds when it is fertilized regularly with mature compost and mowed high.
  
  

Broadleaf Annuals

• Bur clover, black medic, knotweed, spurges, chickweed, and henbit are annual, broadleaf weeds. Mallow and chickweed grow as annuals or perennials. Knotweed spreads low to the ground or grows as an erect annual plant. It attracts beneficial, predatory insects that feed on harmful garden insect pests. Low nitrogen fertility and compaction are soil conditions associated with excessive growth of broadleaf, annual weeds.