**Describe what is meant by a weed, to include ‘a plant growing out of place’.

Describe how weeds cause problems to include:

  • the reduction of plant growth, to include competition for light, nutrients and water.

  • the reduction of the visual appeal of plantings.

  • the role of weeds as alternate hosts for plant pathogens, to include white blister rust of brassicaceae and clubroot.**

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