### plant | tracheophyte | weed:

Annual weed
* Apply to actively growing and small succulent weeds beneath benches.
* Most annual weeds grow from seeds
  - invade lawns
  - produce seeds
* Some annual weeds germinate from seeds.
* are classified as winter or summer annuals
  - more prone to resistance than perennial weeds
* are plants that reproduce by seed and generally germinate each year to reproduce
  - and germinate each year
  - prolific seed producers , ensuring future generations of the species
* complete the life cycle in less than one growing season
  - their life cycle within one year
* emerge from seed, grow flower, produce seed, and die within a year.
* germinate and thrive in disturbed soil
  - from seed, grow, flower, and produce seed in less than one year
* germinate, grow, flower, set seed, and die within one year.
  - rapidly, flower, set seed and die in a single season
* live for one growing season, biennials for two and perennials more than two.
* persist from year to year by a rapid life cycle from seed, to flower, to seed again.
* reproduce by seed and complete their life cycle in one year
  - only by seed and live just one season
* sprout, grow to maturity, go to seed, and die out in one year.

### plant | tracheophyte | weed:

Aquatic weed
* Most aquatic weeds require intense direct sunlight to grow and multiply.
* absorb water and then release it through a process called transpiration.
* are a serious problem for pond owners throughout Georgia
  - harmful to aquatic life and threatens the safety of boaters, swimmers and anglers
  - likely to be a problem in water seeded rice
  - the key pests in California rice fields
* can be extremely invasive and have an economically significant impact
  - clog waterways making boating and swimming difficult
* clog the waters.
* provide an important substrate for the snails.

Biennial weed
* Most biennial weeds grow from seeds.
* grow from seed anytime during the growing season
* live during two growing seasons and reproduce only by seed
  - through two growing seasons, although they also reproduce via seed
* reproduce by seed and complete their life cycle in two years
  - live for two growing seasons
* require two years to complete their life cycle.

Broadleaf weed
* Most broadleaf weeds are prolific seed producers
  - have netlike veins in their leaves and nodes containing one or more leaves
* Some broadleaf weeds have large square seed leaves.
* are a. monocots
  - easy to control with spot spraying
  - much more competitive than are grasses
* compete effectively with corn for nutrients.

### plant | tracheophyte | weed:

Cocklebur
* Most cockleburs are classified as weeds
  - have hooks
* Some cockleburs have distribution
  - hearts
  - worldwide distribution
  - occur in habitats
* are a prime example, causing liver disease and appetite loss
  - very big pest for hikers and nature lovers
  - found throughout the world
  - members of the Compositae
* has heart-shaped or broadly ovate leaves.
* includes cell membranes
  - cells
  - corpi
  - cytoplasm
  - nuclei
  - plasma membranes
  - sections
  - vacuoles
* is also important in some sections as a cause of livestock poisoning
  - considered to be one of the most competitive weeds in soybeans
  - designed for the pollination by wind
  - herbaceous plant that belongs to the sunflower family
  - poisonous to all classes of livestock
  - toxic to livestock, with the capability of causing acute liver failure
  - used in treatment of nasal and sinus congestion in traditional Chinese medicine
* lower the value of wool.
* occurs throughout Ontario around farmyards, in fields, along roadsides and river flats.
* produce two kinds of flowers.
* propagates only via seed that retains ability to germinate for many years.
* serves as a host for a number of pathogens of crops.
* tend to grow in areas that are waterlogged much of the year, but dry during the summer.