Weed can classified in many ways. Some important classifications of weeds are as follows.

01.Classification according to the number of cotyledon which seeds have.

DiocotyledonBroad Leaves & Other GrassesGrass Weed
Monocots SedgesSedges Weed
Table 01- Classification of weeds according to cotyledon

Brod Leaves Weeds – These are dicotyledon plants with net leaves Eg:- Lantana Camara

Grasses – These are monocotyledon plants which have long & rounds shallow stems. Propagation is by stem,root & seeds include Graminae family. Plant vary with size & life time as annuals & perennials.Mostly these plants are consisted with oval shape, flat stem, fleat blade & sheath leaves are long linear parallel veination leaf legule is present.

Meadow Grass Plant

Sedges – These are slimiar to grass,but they have ranked leaves & tranguler solid stems. They frequently have modified rhizomes for strong & propagation also by seeds and cuttings. Eg:- Cyperus iria (Thunessa)

Cyperus iria – Thunnessa

02. Classification according to the growth habit

Vinesvine Weed
ShrubsShrubs Weed
TreesIpil Ipil Tree Weed
Table 02 – Classification of weeds according to growth habit

03. Classification according to the body texture

HerbaceousHerbaceous Stem
WoodyWoody Stem
Table 03 – Classification according to the body texture

04. Classification of weed based on life span

AnnualPlants which complete life span within one year< 1 Year >
BiannualComplete life span within two years< 2 years >
PerennialTake more than two years to complete life span> 2 years
Table 04 – Classification of weed based on life span

05. Classification of weeds according to the habitat

TerrestrialA terrestrial plant is a plant that grows on, in, or from land. Other types of plants are aquatic, epiphytic and lithophytic.Terrestrial Weeds
EpiphyticAn epiphyte is an organism that grows on the surface of a plant and derives its moisture and nutrients from the air, rain, water or from debris accumulating around it. Epiphytes take part in nutrient cycles and add to both the diversity and biomass of the ecosystem in which they occur, like any other organism.Epiphytic-Weed
AquaticAquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that grows in or near water and is either emergent, submergent, or floating.Lotus-Aquatic-Weed
Table 05 – Classification of weeds according to the habitat

06. Classification accounting to association of weeds

Crop bound weedsCrop bound weeds: Weeds which usually parasite the host crop partially or fully for their nourishment i.e parasitism also called as parasitic weeds. Those parasites which attack roots are termed as root parasites and those which attack shoot of other plants are called as stem parasites.
Crop associate weedsCrop associated weeds: such weeds grow along with the crop due to their requirement of microclimate and habitat and survive along the crop in form of mimicry.Eg. Amaranthus viridis and are associated with rice
Table 06 – Classification according to association of weeds