Nodding thistle

Common name: Nodding thistle

Botanical name: Carduus nutans

Management programme: Sustained control

                

Why is it a pest?

Stock don’t usually graze on nodding thistle because of its spiny leaves. Single rosettes can take up an area over one square metre so large infestations can seriously reduce how much stock you can carry on affected land. A single mature plant can survive through drought and can produce up to 10,000 seeds, which can reproduce for up to 20 years.

               

What does it look like?

Nodding thistle is similar to the Scotch thistle, although it’s more erect and spinier. Its flowering stems grow up to 1.5m high and have large crimson flower heads that droop or 'nod' when mature.

Click here to see images

 

                  

    

Sustained control programme

The exclusion programme aims to stop certain pests that are in very low numbers or in surrounding areas from establishing in Otago.

Regional Pest Management Plan

What are the rules?

There is only one rule for nodding thistle and it only applies if you are on rural-zoned land. All occupiers of rural-zoned land must eliminate nodding thistle on their land within 100m of their boundary, where the neighbouring property of that boundary is also controlling nodding thistle within 100m of the boundary.

This is a good neighbour rule and ensures there are no unreasonable costs to land occupiers who are managing nodding thistle when their neighbours might not be. Non-compliance action on this rule will only happen if a complaint is made to ORC by the affected neighbour.

                 

How can I control it?

Spray

  • You can spray rosette plants in the winter or spring before the stem has formed. Most nodding thistle will produce seeds in autumn so spraying in winter will kill most new seeds.
  • Cover the entire plant in spray, cut any seed heads and dispose of them by burning or deep burial.

Granules

  • At any time of the year you can apply granules to the crushed centre of each plant. Make sure you also cut any seed heads and dispose of them by burning or deep burial.

Grubbing

  • Grubbing works best with rosettes and early flowering plants, remove at least 5cm of the root to stop re-growth.

            

Images

            

                 

                 

                 

Definitions

Eliminate – The permanent prevention of the plant’s ability to set viable seed

Land occupier – An occupier is the person who physically occupies the place, the owner of the place and any agent, employee, or other person acting or apparently acting in the general management or control of the place. For example if you are renting a house owned by someone else that does not live on that property, you are the occupier and are responsible for pest management under the pest plan. You can see more about the responsibilities of occupiers (including owners) in section 3.3.1 of the pest plan.

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