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Why Invasive Plants Can Harm Your Garden and What You Can Grow Instead

Invasive plants grown in many Australian homes are a threat to the country's environment and biodiversity. Dr Carol Booth from the Invasive Species Council says escaped garden plants threaten Australia's unique fauna and flora.

"Australia has a massive weed problem, and it's been estimated that three-quarters come from escaped garden plants"

As Dr Booth explains, escaped garden plants not only invade bushlands and riparian areas along creeks and rivers, but also outcompete local plants and destroy native wildlife habitat.

Gazanias are one of the invasive plants causing havoc
to agricultural land and native vegetation in Australia.

YES! Gazanias Surprisingly The Worst Of Invasive Weeds In Australia - Extremely Hard To Remove and The Farmers Nightmare!

I wish people would leave their Beloved Plants Overseas when they Come Here, because they Behave Differently Here than they do in their Countries. My Instincts have told me this strongly for some time, and this Article proves it True. Read on......

So how can you plant a sustainable, environmentally friendly garden that won't cause you future headaches?

This is what horticulture experts recommend.

How to know what to plant

A major hurdle to limiting the spread of invasive plants in Australia is the lack of national regulation in the nursery sector, Dr Booth says.

"It's pretty crazy that the government relies on home gardeners to do the research necessary to make wise decisions about what to plant," she says.

The Australian government has identified 32 weeds of national significance, which are generally prohibited to sell, distribute or grow.

But there are thousands of other weeds in Australia which aren't illegal to sell or grow. It just depends on where you live. 

Horticulturalist Marg Allan works at the Victorian Indigenous Nurseries Co-op (VINC) in Melbourne/Naarm. 

So how can you plant a sustainable, environmentally friendly garden that won't cause you future headaches?

This is what horticulture experts recommend.

She says most invasive plants which become garden escapees are chosen because they are hardy, drought-tolerant and quick growing.

"Agapanthus is a favourite nasty," she says.

"It does look pretty en masse up your driveway, but it's known especially in wetter areas like the Mornington Peninsula to Escape from people's properties."

Ms Allan recommends checking your local council's weed list, Gardens for Wildlife programs and speaking to professional nursery staff.

"It's an exciting opportunity for people to connect with nature and learn about their local area," says horticulturalist Alex Nosek, who works alongside Ms Allan at VINC.

"Home gardeners have an important role in supporting local insects and wildlife," he says.

Other resources include the Grow Me Instead database or state initiatives such as Gardening Responsibly, Dr Booth says.

Here's what she recommends you grow instead of the more popular
invasive plants: 

Invasive plants/ environmental weeds (in some states)Recommended plants to grow instead
Agapanthusblue flax lilies (Dianella species)
Foxglovesnapdragons, delphiniums, white correa
Morning glory / English ivypurple coral pea, wonga vine, native clematis species
Gazaniapaper daisies

Invasive plants impact your garden

While invasive plants are a threat to Australia's unique environment and biodiversity, they can also damage your backyard or apartment.

"If their roots are highly invasive, they might invade your sewerage pipes or get into the foundations. Certainly bamboos are known to do that," Dr Booth says.

University of Melbourne lecturer of urban horticulture Dr Jela Ivankovic-Waters says invasive plants outcompete other plants for resources like water, nutrients and light. In some instances, they kill off other species.

Using climbing plants as an example, she explains how they utilise their small tendrils to hook onto and wrap themselves around a fence, stem or branch of another plant, spreading quickly.

"Morning glory (Ipomoea), for instance, has a lot of problems shading out light, choking and suffocating plants that might be growing underneath it," she says.

It's one of the reasons Dr Ivankovic-Waters says growing native plants shouldn't be seen as an alternative but rather the optimal choice.

How to plant a sustainable garden

Growing native and indigenous plants in your backyard benefits local wildlife, biodiversity, the environment and even your hip pocket.

More gardening tips
Many species require less water and some no fertilisers or pesticides, which means there are less costs involved.

Fiona Cross, horticulturalist at Nillumbik Shire's Edendale nursery in Melbourne's north-east, says it's also important to understand the difference between native and indigenous plants.

While native plants can be from anywhere in Australia, indigenous plants are naturally found in a local area.

"We grow plants that are found in the wild in the bush in Nillumbik, so they'll be more suited to the area and often less likely to be invasive," she says, adding that native plants can also be invasive in the wrong environment.

Indigenous plants also adapt well to local soils and climate conditions, while enhancing wildlife corridors, she says.

"Having a diverse range of indigenous plants can attract a whole range of different insects, to your garden."

Ms Allan says whether you're growing plants in pots in an apartment or a home garden, there are various indigenous species that benefit the ecosystem.

Golden Everlasting Daisies are a plant that Brightens up a Balcony and Attracts Pollinators, she says.

"Smaller flowers that attract bees, moths and butterflies are Important Ecologically."

A spokesperson for the Department of Climate Change, Energy, the Environment and Water says the Australian government recognises the Serious Threat posed by Invasive Plants, including Escaped Garden Plants, to the nation's Unique Native Plants and animals.

The government is developing a threat abatement plan in collaboration with state and territory governments.

"It will provide a national framework to reduce the impact of these weeds on Native Species and Ecosystems," they say in a statement.

"The plan will set out a range of tools to address the threat, which may include regulation."

Janets Comments
I strongly disagree with that statement. As most of us know full well "Albanese and his Crew are GREAT PRETENDERS" a Useless Force when it comes to getting THE IMPORTANT THINGS Done!!!

Back Pauline Hanson and One Nation the best you can Folks. That Wicked Albanese Government have ALL but Destroyed This Country (they've destroyed so much of Our Peace and Safety, Our Values and Wealth) I've Never been a "Party Voter" and have Always Voted for Independents. Last time, I backed Peter Dutton - to get Albanese Out, only to find his own Party didn't back him. As the new adage says "I don't trust Labour OR Liberal" and "Pauline and Barnaby ARE Our Best Hope" they're Far More Genuine. The Major Parties have been Giving us Headaches ever since I was Voting Age. Lets Show them We Mean Business and Take Our Country Back!

Bright and colourful gazanias are popular at many Australian nurseries, but farmers, environmental groups and researchers are calling for government regulation to ban the sale of what is also an invasive weed with the potential to cause real damage to agriculture.

They are not only overrunning roadsides, native grasslands and coastlines but have also invaded paddocks in South Australia, Victoria and parts of Western Australia, making productive farmland unviable and causing significant economic losses.

In paddocks where Loxton farmer Robin Schaefer would usually grow lentils or other legumes, gazanias have taken over.

"They just exploded. Gazanias take over the environment, and nothing else will grow around the plants," Mr Schaefer said.

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