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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 />

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