North Canterbury News: August 17, 2023
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RURAL LIFE<br />
The <strong>North</strong> <strong>Canterbury</strong> <strong>News</strong>, <strong>August</strong> <strong>17</strong>, <strong>2023</strong><br />
29<br />
Beware of ecological invader Spur Valerian<br />
APort Hills rangerhas cautioned Hurunui<br />
to act against the ecologicalinvader Spur<br />
Valerian whilethere is stilltime.<br />
At ameeting in Amberley, Christchurch<br />
City Council Port Hills Ranger Di Carter<br />
said there was an opportunity for Hurunui<br />
to contain the spread of Spur Valerian<br />
(Centranthus ruber). The ecological weed<br />
has already invaded Banks Peninsula.<br />
Hurunui District Council’sWater and<br />
Land coordinator RimaHerber called the<br />
meeting to lookatsolutions for Hurunui,<br />
bringing together landowners living near<br />
two major Spur Valerianinfestationareas<br />
up the Waipara River and in the Ram<br />
Paddock Roadarea of the Waipara Valley.<br />
Stakeholdersincluding Waka Kotahi and<br />
QEII National Trust also attended.<br />
Ms Carter said a10year spraying<br />
programme had been developedfor Banks<br />
Peninsula in 2013, with funding from<br />
Christchurch CityCouncil and<br />
Environment <strong>Canterbury</strong>, at acost of over<br />
$60,000 ayear.<br />
This followed acoastalcliffsurvey in<br />
2012 highlightingpockets of SpurValerian<br />
growing along the cliffs.<br />
At accessible sites it’sbeen 10 years of<br />
two controls aseason to get it down to a<br />
handfulofseedlings per visit.<br />
‘‘We spray onceayear, withthe coastal<br />
cliffsites being done by helicopter.<br />
‘‘By doing this we’remanaging to hold it<br />
back to PigeonBay.<br />
‘‘ Ifly withthe pilottominimise nontarget<br />
damage, and we do the Mount Evans<br />
area by foot,’’ saysMsCarter.<br />
‘‘With someofthe areas around Mount<br />
Evansbeing very vast,it’s easy to miss<br />
seedlings, so we also do an hour or two by<br />
chopper each year.’’<br />
Spur Valerians windborne seeds are<br />
easily dispersed and the plant thrives in<br />
rock clefts, dry riverbeds and roadside<br />
cuttings,where it is quick to choke native<br />
species.<br />
Spur Valerian migratesfrom peoples<br />
gardens.<br />
‘‘Inacontrolled environment,where<br />
seedheadsare removed directly after<br />
flowering and regrowth, and seedlings are<br />
destroyed, the plant can be contained.<br />
When it escapes into our rural areas, it<br />
quickly takes over,’’ Ms Herbersaid.<br />
Christchurch City CouncilSenior<br />
Ecologist Nicholas Headtold the meeting<br />
that the limestone ecosystems throughout<br />
theWeka Passarea and the Waipara<br />
Gorge, whichare under the threatofSpur<br />
Valerian infestation, havevery high<br />
ecological values.<br />
‘‘They support some of the rarest and<br />
most threatened plants in the country,<br />
including the Weka sun hebe (Heliohebe<br />
maccaskillii)and Waipara gentian<br />
(Gentianella calcis, subsp waipara)that<br />
only occur in the HurunuiDistrict.’’<br />
‘‘Today, technologyoffers solutions that<br />
will helpusasacommunity to protect our<br />
Hurunuienvironment,’’ Ms Herber said.<br />
Carter said adapting drones to<br />
accommodate oblique angles on cliffs was<br />
somethingPort Hillspark rangerswere<br />
considering.<br />
‘‘We’reslowly progressing the<br />
technology to make it work.<br />
Ms Herber said it was great to get a<br />
commitment fromWaka Kotahi at the<br />
meetingtomeet onsitewith spraying<br />
contractors to work out aplan for the<br />
roadside at Weka Pass, where an<br />
infestation is threateningthe limestone<br />
bluffs above the road.<br />
Hurunuistakeholders and landowners<br />
will be joining Ms Herberover the next<br />
few weekstogoonsite to areas where<br />
Spur Valerian is gaining afoothold in the<br />
district.<br />
Invader ... Spur Valerian in the Waipara<br />
River.<br />
PHOTO:FILE<br />
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