moved here 18 months ago and have spent much of the time cleaning
up and clearing the section of rubbish and garden waste. We have
been attempting to get rid of huge quantities of oxalis and convolvulus
and at the moment we appear to be winning. Unfortunately, while
we have got most of our section clear, the neighbours on three sides
have also got lots of convolvulus and are not keen gardeners like
us. Do you know of any permanent way of stopping the convolvulus
from coming back into our section? On one fence there is some corrugated
iron which I think was supposed to stop it coming through, but the
convolvulus has gone underneath and in between the spaces where
the pieces have overlapped. We have used Round Up which has only
been a temporary stopping solution. Any other ideas?
is a hard one I have the same problem at home with invasive
plants coming into my garden from bush behind us. I am going to
invest in a slasher! I have found the best way to get rid of oxalis
is to dig it out and just keep digging.
Round Up is not very
effective on convolvulus. It will tickle it, but has no lasting
effect. However, Round Up does have the benefit of being non-residual.
The best spray for convolvulus
is Woody Weedkiller. It needs to be applied when the plant is actively
growing. Spring and autumn are a good time. Mid-summer is not a
good time. The best way to treat it at this time of year is to clear
the convolvulus by hand, and when new growth comes through, spray
Results are slow. You
may not see any effect for up to four weeks after application. Repeat
this process on any new growth. Take care not to let the spray drift
onto other desirable plants.
The disadvantage of Woody
Weedkiller is that it is residual and the ground cannot be planted
for six months in the area that has been treated.
I would say the corrugated
iron has been put in to try and stop the weeds coming through. Unfortunately,
the depth you would need to go makes this an unpractical solution.
It always seems to find a way through!
Other than talking to
the neighbours and asking them if they can keep it under control,
you will just need to keep plugging away at it.
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
with permission from NZOOM Home and Garden content,
from the previous
The views expressed here are not necessarily those of the RNZIH