Annual weed seeds can survive for years in the soil, waiting for the perfect conditions to grow. They germinate at lower temperatures than most garden plants and can grow and set seed very quickly.
Link to Resource (https://www.purdue.edu/hla/sites/master-gardener/wp-content/uploads/sites/9/2016/09/Purdue-Master-Gardener-Guide-to-Common-Lawn-and-Garden-Weeds.pdf) ...
It is common in cultivated fields, gardens, roadsides, ditch banks and waste areas throughout the western U.S. While it is usually considered an objectionable weed, kochia is readily grazed by ...