|Production threat||Environmental threat||Public threat|
Boneseed is a fast growing bushy shrub up to 3m tall. Seed germination can be triggered following bush or scrub fires.
Boneseed poses a threat to low coastal vegetation, where it can rapidly replace native plants. It shades out seedling trees like pōhutukawa that need a lot of light to survive. Its thick growth can also restrict people’s access to beaches.
Boneseed can be difficult to control because of the large numbers of seeds it produces, which can remain dormant in the soil for up to 10 years. Birds and possums eat the fleshy fruit and spread undigested seeds into neighbouring shrub lands and coastal forests.
A native of South Africa, boneseed was first brought to New Zealand as an ornamental plant but its spread has seen infestations found around many parts of the Coromandel Peninsula including Whiritoa, Whangamata, Cooks Beach, Coromandel Town and Port Jackson. It also occurs on the west coast around the townships Raglan, Kāwhia and Port Waikato. Boneseed grows best in dry and sunny conditions in coastal areas, cliffs, sand dunes and wasteland. It doesn’t like heavy shade or wet soils.
All landowners/occupiers in the Waikato are responsible for controlling boneseed on their properties and are required to work with Waikato Regional Council in areas where control programmes are in place. Boneseed is also banned from being sold, propagated, distributed or included in commercial displays.
Apply with a low pressure sprayer using solid cone nozzle or a paintbrush. Liberally treat the full circumference and the basal parts of the shrub or tree trunks in a manner that thoroughly wets at least 2-3 times the diameter of the lower stem or trunk including the root collar area.
Cut stems at ground level and immediately coat the stump liberally with herbicide to cover the top and sides of the stump.
Cover all leaf surfaces with herbicide where stump cutting is not practical. Best results are achieved from spring to autumn.
Disclaimer: Any product names mentioned below are not an endorsement nor are they a criticism of similar products not mentioned.
|Glyphosate||Cut stump treatment/spray application.|
|Metsulfuron||Cut stump treatment/spray application.|
|Triclopyr||Cut stump treatment/spray application.|
|Triclopyr/picloram mix||Cut stump treatment/spray application.|
|Picloram gel||Cut stump treatment.|
|X-Tree Basal ®||Basal treatment of trunk.|
|Herbicide rules will apply. You may need to notify neighbours if spraying. The Waikato Regional Plan explains the agrichemical (herbicides) use rule in section 6.2|
After initial control, it’s important to:
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