Basic Pest Information

Annual Weeds

  • Reproduce by seed only
  • Germinate, flower and die in one season

Biennial  Weeds

  • Reproduce by seed
  • Use 2 growing seasons to produce seed
  • Germinate in 1 year usually, flower next year then die after seeds disperse

Winter Weeds

  • Germinate in late summer and early fall
  • May also grow same as annual plants
  • Have a thick storage root enabling good survival in adverse conditions such as winter

Perennial Weeds

  • Same plant reproduces year after year
  • ​Reproduce by seed or other vegetative parts
  • Can regrow every year even after loosing all foliage

Basic Weed Roots

  • Tap Root 
  • Creeping/Horizontal Root 
  • Fibrous root 

Basic Weed Stems

  • Stolon/Creeping Stems
  • Tiller Stems
  • ​Rhizome/Modified Stems



Creeping Root and/or Rhizome Stems i.e.

  • Canada Thistle
  • Sow Thistle
  • Quack Grass

Tap & Fibrous Root with Tiller Stem i.e.

  • Dandelion
  • Plantain
  • Foxtail Barley

Tiller Root with Stolon Stem i.e.

  • Clovers
  • Creeping Charlie
  • Creeping Bellflower
  • Virginia Creeper (not a weed)