Monoculture: Human practice of growing a single plant specie for food/crop. In nature, invasive plants more likely than natives tend to take over a small and/or big amount of land and create a single specie monoculture of their own.
Annual: An annual plant completes its life cycle in a year. It germinates from seed, grows and reproduce within 12 months. There are Summer annuals and Winter annuals. Summer annuals germinate during spring or early summer and mature by autumn/fall of the same year. Winter annuals germinate during autumn/fall, stay dormant over winter and mature/reproduce during the spring or summer of the following year.
Biennial: A biennial plant completes its life cycle in two years. On the first year it germinates from seed, grows roots and leaves, then stays dormant over winter with a few basal leaves (commonly known as a rosette). On the second year it dies after producing flower and seed during spring or summer when weather warms up. There are fewer biennial plants than either annual or perennial. There are no biennial grasses; all grasses are either annual or perennial.
Perennial: A perennial plant lives for more than 2 years. There are perennial and annual wildflowers/forbs, aquatics and grasses; all trees, shrubs, sedges, rushes, ferns and horsetails are perennials. Some perennial plants are herbaceous which means the top growth dies down after flowering and producing seed, then grows back the next year from the established root system.
Native: A plant that is endemic (indigenous) to an area. This website includes plants in the Pacific Northwest, including but not limited to British Columbia, Washington, Oregon & California.
Weed: A plant that was introduced for its beauty or fruit. Brought as ornamentals or crops, these plants are now spreading out of control. A plant may be a weed in one place but not in another. (wrong plant, wrong place)
Ornamental: A plant introduced for home and garden beauty. Some ornamentals will soon be considered weeds due to their spreading habits.
Crop: A plant cultivated and harvested for food. Some natives and weeds are used as crops.