Tracey Bool Garden Writer
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   Make friends using companion plants in your garden

What is companion planting I hear you ask? Companion planting is about maintaining plant and garden health through beneficial relationships, such as, disguising or repelling vulnerable plants from pests, adding nutrition to the soil, and encouraging wildlife and soil-abundant gardens. Companion planting compliments existing systems, that is, enhances a diverse and cared for garden. Essentially, companion planting is about fostering this garden diversity.
 
There are several underlying principles of companion planting including:
  • Disguising vulnerable plants through the use of companion plantings, which obscure/confuse/repel pests via sight and/or smell;
  • Planting to encourage predators, including wildlife. Having a range of plants in your garden which are attractive to predators - such as parasitic wasps, lady beetles and birds - is one of the most effective ways of preventing and controlling pest outbreaks in your gardenscape;
  • Choke out weeds with desirable plants. Many weeds have foliage and flowers which are particularly attractive to pests – planting wanted plants instead removes this food source and helps keep pest numbers in check;
  • Using Nitrogen fixing and deep-rooted plants for mining nutrients from further down the soil profile. Maintaining plant health through organic growing methods and optimum nutrition makes them less vulnerable to pest attack. Green manure crops from the legume family are an excellent nutrition and food source for beneficials and nearby plants.
Understanding the principles of companion planting means you don’t have to know and remember which plants go together and for what purposes.
 
There are potential challenges and limitations with companion planting to be mindful of, such as:
  • What works elsewhere isn’t necessarily going to and often doesn’t work in Australia. Australia has a different climate, soils, plants and pests to many overseas locations. Utilise Australia-specific companion planting resources to ensure success;
  • Companion planting alone isn’t going to guarantee harmony and a pest & disease-free garden; you also need to create and maintain healthy soils and utilise a variety of plants which are hardy to your   environment.  
Tips when using companion plants:
  • Size and volume counts – for example, tall plants need tall companion plants, and they also require a proportionately large volume of companion plants surrounding them for effectiveness;
  • Careful planning, soil improvements, and adequate watering and nutrition, all significantly contribute to the health of your garden and compliment companion planting systems;
  • Every garden is different; observing what works in your situation is key.
 
Some valuable companion plants:
  • Native plants – many predators are native so growing native plants is highly beneficial. Using Australian natives, especially local species, helps attract native birds & other predators and control pest numbers;
  • Herbs – attractive to beneficial insects and predators; use to disguise from pests and as a deterrent because of their strongly scented foliage;
  • Alliums such as spring onion, onion and garlic – repels sap suckers and cabbage white butterflies; flowers are attractive to beneficial insects and other predators;
  • Flowering veg such as cabbage, dill, fennel, carrot, parsnip and radish – an especially valuable food source for predators.

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Many flowering veggies, including carrots, are irresistible to beneficial insects and are therefore indispensable as companion plants.
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Deep rooted plants, such as comfrey, help mine nutrients from deep down in the soil profile, which is highly beneficial to nearby plantings.
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Calendula and marigolds make great companion plants.
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Australian native plants are perfect companions as they are a food and habitat source for predatory insects and wildlife, all of which help keep pest numbers in check.
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