Weed of the month: Garden fad spreads spiny pest

Phoenix palms have been the darling of developers the last couple of decades, with nice specimens being transplanted from older properties to new ones to help create  "iconic'' sub-tropical landscapes. Their single, thick, non-branching trunks make them particularly attractive as specimen palms, and the branched clusters of yellow-white flowers that develop into fleshy, purple, date-like fruit add a splash of colour and interest during summer.
The subtropical palm fashion trend has increased the frequency of plantings of phoenix palms, chinese fan palms and bungalow palms, which gives these palms a nudge towards a higher weedy status. With wild spread increasing to nuisance levels in some areas, these plants pose a cost to the taxpayer in the long run.
Why is it a problem?
Go to Ocean Beach and see the seedlings spreading along roadsides and into mature coastal bush - bird-spread as far as Peach Cove. Phoenix palms in dune areas can alter the topography as sand builds up around the roots, resulting in erosion elsewhere. The seeds are spread by birds and water into natural areas. Phoenix palm thrives in a variety of habitats, will self-seed into paddocks, roadside and push out natives in a forest situation. Long-lived mature palms displace native trees through sheer size, and the sharp spines on the leaves can injure humans and animals.
If you or your stock live near Phoenix palms take care after windy conditions. Frond spines are a health hazard and should be treated immediately by a medical practitioner to remove residual pieces of spine and thereby avoid swelling and infection.
What can I do?
Dig out seedlings and small plants and dispose of them at a refuse transfer station. Larger palms can be cut and stumps painted with a suitable herbicide. See www.weedbusters.org.nz for more control information.
Alternatives are?
Try the native nikau palm (Rhopalostylis sapida) or cabbage tree (Cordyline australis). Your local garden centre will be able to suggest other suitable non-weedy species for your local growing conditions.