Sep 112008

Living with possums isn’t always easy, but there are a few things we can all do to live in harmony with possums in our shared urban spaces. Let’s face it… we are never going to get rid of them all together, and why should we? They were here long before we were, and it is our destruction of their habitat that has forced them into our houses, our gardens, and lives. So, what steps can we take to make sure we can all get along together?

Possums in the roof?

There is one reason that possums will shift in to our roof spaces… lack of hollows in their habitat. You see, Common Brushtail possums utilise tree hollows for resting and nesting during the day, and are pretty happy to do so. But, the removal of remnant trees in urban areas has severely diminished the number of hollows available, and thus, we end up sharing our houses with them. So, what can we do to help them… and us? If you currently have possums in the roof, here are a couple of tips that should encourage them back into the wild:

1. Make or buy a suitable nest box for the Common Brushtail possum, and install it in your garden to act as an alternate den site for our furry friends. For more info on nest boxes, check out for more info.

2. Locate the nest the possum has built in your roof, remove it (when the possum is out and foraging) and place this inside the nest box. This will encourage the possum to move to its new location.

3. Place a piece of fruit inside the nest box. Apple or bananas seem to work best. This will entice the possum to investigate the nest box, and hopefully decide to stay. It should be stressed that feeding of possums is not recommended (except as a one off during relocation).

4. Block of access to your roof. This can be done by loping any overhanging branches, and placing collars around the trunks of trees that possums utilise to access the roof. Collars can be made from a number of products, but 60cm wide sheet iron seems to work pretty well.

5. Place camphor blocks OR mothballs in the roof space, particularly around the area where the nest site was. DON”T place both! Possums really dislike these smells, and will be reluctant to return.

6. If possible, pop a light up in the roof space, and leave it there for a few days (on of course!). The combination of alternate nesting site, bad smells and light should be sufficient to discourage them.

7. Once you are satisfied that the possum has left the building, block any known entrance points. Wiping around the entrance points with household bleach will remove possum scent, and make re-entry pretty unappealing!

Possums eating your plants?

Even the most patient and wildlife friendly gardeners tear their hair out over this one, but, after significant research, I can tell you that there are solutions to stop your precious plants being gobbled by hungry possums! Possum repellents work by two methods: taste and smell! Research conducted has shown that smell deterrents are somewhat more effective than taste, but also suggests that a starving possum will eat just about anything! So, here is a list of some tried and true methods of deterring possums.

1. Net affected plants with shade cloth or white bird netting at night time. Quick, cheap, and darn effective! This is absolutely the best way to protect young plants and seedlings from possum attack. Why not supplement this with a hanging cat scare face or two? Available from nurseries, these scare faces look like cats and have reflective eyes, pretty scary if you are a possum!

2. Sprinkling blood and bone fertiliser around the base of ornamental plants and fruit trees can act as a significant possum deterrent. They hate the smell, and will be less inclined to munch on treated plants!

3. A home made garlic spray of 2 tablespoons of crushed garlic in one litre of hot water, left to stand over night, strained and sprayed onto foliage, fruits and tasty growing tips is an old favourite of mine, and it seems to work. Subsequently, try chillies or Indonesian fish sauce. Just remember to wash your produce before eating!

4. A spray made from Quassia chips (chips of bark from a South American tree). Add 100 g chips to 2 litres water and heat for one hour before straining. Add one tablespoon detergent. Dilute at rate of 1 part of solution to four parts water and apply as a spray. Quassia chips are available at many nurseries, and are pretty affective, forming the base ingredient of many commercially available possum repellents (e.g.: Poss-Off).

5. My grandmothers’ personal favourite, and one she swears by, is the tea-based deterrent. Boil two litres of water; add 4 heaped teaspoons of Lapsang Souchong tea and leave to cool. Strain of liquid and apply from a plastic spray bottle directly onto affected plants. Reapply every two weeks and always after rain. Make a fresh brew every time.

6. Wack a bit of undiluted Tabasco sauce on affected plants……a sure solution unless your possum likes it hot!

7. A watered down solution of a little detergent and some English mustard sprayed directly onto the foliage and fruits of tasty plants.

8. Commercially available possum deterrents such as Poss-Off or Scat, work by emitting an unpleasant odour, so, when used according to the instructions on the products, claim to deter the little blighters!

It should be remembered that no one solution is guaranteed, and reapplication of sprays should be a regular and on-going activity. It is recommended that most sprays be re-applied every two to three weeks, and after rain. Try using these repellent sprays along “possum highways” as well (e.g.: tops of fences, well used tree branches). As possums are creatures of habit, any disruption to there regular routine can be really upsetting, and will often result in the possum moving away to seek a feed elsewhere.

Persistence is the key! A habit (as we all know) is not broken in a day, so keep up the spraying, re-apply, and over time the undesirable behaviour should dissipate. Good luck!

  One Response to “Living with Possums”

  1. There was a scientific study on the effectiveness of these and other deterrents (, the results suggest that when possums are hungry, no smell/taste deterrents stop them.

    In my experience, I have used a home made spray made with powdered garlic and boiled down habanero chillies, I needed a mask to apply it, and it failed. Blood and bone also failed to stop the possums. I have also bought the extruded netting (white plastic netting) from Bunnings, and the possums can just eat straight through it.

    The only definite solution is chicken wire or other strong netting (READ: metal reinforced netting).

    Such a shame that these natives (now pests) prevent so many urban gardeners in Melbourne from being self-sufficient as it is illegal to humanely remove possums.

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