Many of the road-side and rail-side
reserves of Drouin contain two particular weed species of some concern, Wild
Tobacco Tree, (Solanum mauritianum), and Sweet Pittosporum, (Pittosporum
undulatum).
Wild Tobacco Tree - more a shrub than a
tree - is from South America and is a very invasive and highly toxic species. The
unripe berries in particular are highly poisonous and have been known to cause
deaths in stock animals, (and humans by all accounts!). For some people, even
the fine hairs on the underside of the leaves can irritate the skin.
Wild Tobacco Tree out competes native
vegetation and can tolerate a wide range of environmental conditions. It
particularly likes disturbed sites and is stimulated by fire. Some birds and
mammals will eat the ripe fruit and this is thought to be the main way the
species is distributed.
Sweet Pittosporum is a native species that
originated in Queensland but has now spread right down the south-east coastal
strip and elsewhere, even to other countries. It is a fast grower and can
quickly out-shade other native trees, shrubs, herbs and grasses.
Considering the environmental damage that
can be done by this species, it is hard to fathom why it is still sold in plant
nurseries. This invader too, is principally spread by birds and mammals that
eat the fruit.
Whilst ‘one
man’s weed is another’s wildflower’ is a popular adage, when it comes to
some species perhaps a modicum of prudence might be advisable!
Note: There are numerous websites that
offer suggestions as to how to eradicate these and other weeds. Here’s a link
to the Baw Baw Shire’s Weed Control page.
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