Nassella tussock is an invasive grass which is spreading within South Canterbury and North Otago. It displaces other grass species and is unpalatable to stock. One mature plant can produce 100,000 seeds which can then be dispersed by wind, water, wool, machinery, or hay transported between locations.
There are several registered sites within the Hakataramea catchment and surrounding districts. With a series of recent discoveries on local properties it’s a good time to ensure you can identify Nassella and understand the importance of effective control and preventing further spread.
North-facing hillsides and free draining soils where dry conditions or pastures open up each year are more susceptible to infestation. Landowners and managers should search land annually to identify and eliminate any plants even when there hasn’t been a known problem previously.
Leaves are tough, tightly rolled and thin. They will not break when pulled and feel rough when you run your fingers down the leaf. Plants have swollen creamy coloured stem bases, and fibrous root systems making them difficult to pull by hand even when small. From October to December purple flowers on slender stems are displayed. These droop as they mature.
The HSC have information and identification booklets available, to request one please email natalie@hakatarameasc.co.nz, or click the link below to download the handy Ute Guide.
If you’re not sure about whether you’ve correctly identified Nassella, Environment Canterbury’s Biosecurity team are also happy to pop out and take a look. Contact Environment Canterbury on 0800 324 636 or email biosecurity@ecan.govt.nz.
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