The earliest known plantings in Nelson were around 30 years ago in the Dodson Valley area and the plant has been spreading since that time, but is still quite localised to the Atawhai/Malvern Hills area.
It is becoming a major pest in other parts of NZ and if it is not stopped now, it will be only a matter of time before it becomes a huge problem in Nelson, overtaking gardens, shrubberies, reserves and regenerating native forests.
Nelson City Council is taking the approach that time and effort spent now to reduce and potentially eradicate this plant from Nelson will save labour and money in the future, especially if the plant continues to spread at the current rate.
What does it look like?
The Taiwan cherry is a deciduous tree that grows up to 8m high. Its leaves are serrated, thin, and cherry-like. The flowers are deep pink, in bell-shaped clusters and it has shiny scarlet fruit 1cm across from October to December.
Why is it a problem?
Flowers are visited by tui and bell birds. The fruit size suggests blackbirds will be the main distributors of seeds but some of the smaller fruit will also be available to wax eyes. Native pigeons are also likely to spread it but this has not been observed in Nelson.
Possums may spread the seed too, but this would be very minor.
The plant invades all types of shrublands, light gaps in the forest, roadsides, gardens and reserves. It has the potential to spread and dominate over native vegetation displacing it completely and negatively impacting on entire naturally occurring ecosystems. Taiwan Cherry could cause problems comparable to Old man’s beard if it is not brought under control quickly.
Unlike nearly all other woody weeds in the Nelson area, Taiwan cherry seedlings are very shade tolerant and with its characteristic single leader growth form, it is able to push up through over-head cover.
How do I get rid of it?
Larger trees can be removed by Nelmac staff at no cost to you. Contact Nelmac directly on 546 0910.
- Pull out any seedlings
- Cut the tree down and paste the stem with a 50/50 glyphosate (eg Roundup) and water mixture, or with Vigilant® gel, immediately after cutting; or
- Drill 12-14mm holes at 200mm intervals around the trunk and fill with10-15mls of undiluted glyphosate; or
- Spray (during summer) with 5g metsulfuron-methyl (600g/kg e.g. Escort®) per 10 litres water or 60ml Brushkiller per 10 litres water.
Control methods for pest trees and shrubs
There are a range of methods available to control pest plants. The following recommendations – which are only a sample of those available – are based on safe-use methods that have proven effective.
- Physical removal of the plant and all fragments to a land fill is the best organic method.
- Slashing, mowing or otherwise removing plant material and then treating the stumps or regrowth reduces the amount of chemicals needed.
- Always apply chemical to the cut stump immediately after cutting.
- Spray is recommended for large areas.
- Penetrant aids the uptake of herbicides – there is a range available, e.g. Pulse®, Boost®, Freeway, Dewdrop, and Kiwi Buddy Uptake crop oil.
- Follow-up is always recommended until all the seed has gone from the soil.
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY and follow all instructions and safety requirements.