Plant
Doctor Archive
Oxalis
and ginger
 I
have just moved into a new house and the established garden has
a couple of noxious weeds — oxalis and ginger. How do
we get rid of these pesky things?
 I
asked our resident weed expert, Reg Lewthwaite. Reg said:
There are two techniques
you can use:
a) If the
problem isn't too big, you can use physical methods. For oxalis
you can dig it out, taking care to lift all the root system and
collect the bulbs for destruction in your backyard fire or put them
out with the rubbish.
Ginger is hard work to
dig out if it has established big plants. Again, you need to
get rid of all the rhizomes or it will grow again.
b) The easiest and
most practical method for bigger problems is to use agrichemicals.
For oxalis you can use glyphosate (Roundup). You need repeat
sprayings that hit the new leaves as they emerge from the bulbs.
I have heard that Escort also does a good job.
For ginger, Escort is
a good choice. You spray it on the leaves and wait until it
kills the plant. It is quickly translocated as it moves into
the plant. It stops cell division in the roots and leaves,
so it always takes a while to show visible symptoms. Be patient!
 Advice
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
Reproduced
with permission from NZOOM Home and Garden content,
from the previous
website of 
The views expressed here are not necessarily those of the RNZIH
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