If you glance through your botanical books you will see often added to certain names, 'a troublesome weed'. They are in balance with nature in their native areas where they are held in check by the various indigenous pests and pathogens. This section is about weeds and their place in the garden, weed biology, weed prevention, and weed control. Annual weeds reproduce only by seed and live just one season. In a period as short as a few weeks or months, they germinate, shoot up, blossom, set seed and die.
Winter annuals germinate in the fall, mature in the winter, and die early summer.
The seeds remain dormant until the fall. Summer annuals germinate in the spring, mature in the summer, and die in the fall. The seeds remain dormant until the spring. Annual weeds characteristically produce a great number of seeds. These seeds have the ability to become established in a wide range of environments and to remain viable over an extended period of time.