just moved into a property that has several large woolly nightshade
plants. The previous owner tried to kill them off by chopping them
down, but they've just sprouted away again, stronger than ever.
A friend tried spraying some at his place with Roundup, but it didn't
completely kill them. What is the best way to kill them off?
nightshade (Solanum mauritianum) can be hard to get rid of.
The most effective way is to pull out all the young plants before
they get established. With older ones it's best to cut them down
before they set seed, as birds eat the berries and spread the seed
Cut the plants close
to the ground and treat the stump with Vigilant, which is available
from garden centres and very effective against woolly nightshade
and many other woody weeds. It was originally developed by scientists
at HortResearch to help Department of Conservation staff control
woody weeds like old man's beard. It comes in the form of a gel,
which you apply to newly cut stumps and the active ingredient is
absorbed into the root system. Make sure you wear gloves and follow
the label recommendations. It may pay to wear a dust mask when you
cut down large woolly nightshade plants, as their leaves give off
fine hairs that can be irritating if breathed in.
Gardener, Issue 149, 2004, Page 26
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.