The following list of weeds includes plants that appear where no one planted them. Among them, you'll find both lawn invaders and field pests.
POPULARSensitive Plant
Mimosa pudica
POPULARSmall-leaf spiderwort
Tradescantia fluminensis
POPULARBaby's Tears
Soleirolia soleirolii
West Indian Lantana
Lantana camara
Santa Barbara daisy
Erigeron karvinskianus
Yarrow
Achillea millefolium
Kidney weed
Dichondra repens
Purslane
Portulaca oleracea
Sprenger's asparagus
Asparagus aethiopicus
Myrtle spurge
Euphorbia myrsinites
Creeping jenny
Lysimachia nummularia
Wormwood
Artemisia absinthium
Chameleon plant
Houttuynia cordata
Blue vervain
Verbena hastata
puncturevine
Tribulus terrestris
annual bluegrass
Poa annua
cannabis
Cannabis sativa
selfheal
Prunella vulgaris
cornflower
Centaurea cyanus
thale cress
Arabidopsis thaliana
common comfrey
Symphytum officinale
great mullein
Verbascum thapsus
mugwort
Artemisia vulgaris
St. John's wort
Hypericum perforatum
sweet wormwood
Artemisia annua
jimsonweed
Datura stramonium
black nightshade
Solanum nigrum
corn poppy
Papaver rhoeas
rough bluegrass
Poa trivialis
eastern poison oak
Toxicodendron pubescens
castor oil plant
Ricinus communis
sacred datura
Datura wrightii
common blue violet
Viola sororia
butterweed
Packera glabella
greater burdock
Arctium lappa
Aztec tobacco
Nicotiana rustica
spotted dead-nettle
Lamium maculatum
common ragweed
Ambrosia artemisiifolia
nutgrass
Cyperus rotundus
milk thistle
Silybum marianum
tree of heaven
Ailanthus altissima
Japanese honeysuckle
Lonicera japonica
mock strawberry
Potentilla indica
white clover
Trifolium repens
prairie sage
Artemisia ludoviciana
catnip
Nepeta cataria
bitter lettuce
Lactuca virosa
high mallow
Malva sylvestris
evening primrose
Oenothera biennis
false indigo bush
Amorpha fruticosa
rosarypea
Abrus precatorius
Red Clover
Trifolium pratense
Greater Plantain
Plantago major
metel devil's trumpet
Datura metel
orange balsam
Impatiens capensis
Bermudagrass
Cynodon dactylon
Wild Pansy
Viola tricolor
bouncingbet
Saponaria officinalis
turkey tangle fogfruit
Phyla nodiflora
mare's tail
Erigeron canadensis
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Calling something a weed is more a matter of subjective judgment than a botanical fact. Any plant on Earth becomes a weed the moment it grows where you don't want it. That same plant may be someone's pride and joy elsewhere — for example, a dandelion feeds bees and is perfect for a salad.
The scale of this phenomenon is truly astonishing, as only about 8,000 of the world's 250,000 known plant species behave like weeds. Only 200-250 of these actually cause crop damage, so not all weeds deserve their bad name.
A weed's life cycle reveals much about its tenacity. Some complete their cycle in one season, while others require two years. Many simply take root and return each time.
In the table below, you'll find the names of weeds sorted by this life cycle, which determines the speed and range of their spread.
Perennials are the most troublesome for gardeners, as removing the tops only stimulates new growth. Annuals, on the other hand, reproduce by seed, so early control really pays off. Each species requires its own approach.
Weeds are also divided into distinct groups based solely on their structure. Broadleaf weeds have broad leaves with branched veins — dandelion and clover are classic examples. Grassy weeds such as crabgrass, on the other hand, have narrow leaves with parallel veins.
Sedges quietly complete this trio, looking very similar to grasses until their sturdy, triangular stems give them away. The grid above matches the names of weeds with pictures, so you can identify at a glance what's invading your borders.
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