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If all the seed of an annual, for example common Purslane, were to germinate in the spring following set, and if a freeze, flood, fire, or some other event were to destroy all the seedlings, theoretically, purslane would vanish from the face of the Earth.
ANNUAL PERENNIAL GRASSES GRASSES Annual bluegrass Bentgrass Barnyardgrass Bermudagrass Hairy crabgrass Dallisgrass Smooth crabgrass Tall fescue Green foxtail Johnsongrass Yellow foxtail Kikuyugrass Goosegrass Knotgrass Fall panicum Nimblewill Rescuegrass Purple nutsedge * Sandbur Yellow nutsedge * Six-weeks fescue Quackgrass Smutgrass Torpedograss Velvetgrass BROADLEAF WEEDS Creeping beggarweed Wild garlic Pigweed Field bindweed Hawkweed Pineappleweed Bittercress Healall Broadleaf plantain Burdock Henbit Buckhorn plantain Creeping buttercup Ground ivy Common purslane Carpetweed Knapweed Shepherdspurse Wild carrot Knotweed Red sorrel Common chickweed Lambsquarters Speedwells (spp.
Common purslane Rubiaceae Richardia brasiliensis Tropical Richardia Tiliaceae Gomes.
Common purslane (Portulaca oleracea)--also known as duckweed, fatweed, pursley, pussley, verdolagas and wild portulaca--is the most frequently reported "weed" species in the world.
The same goes for common garden weeds like crabgrass and common purslane.