As the weather warms up in Australia, the arrival of spring and summer often brings more than just sunshine, it also brings mosquitoes, especially after rainfall. These pests thrive in warmer, wetter conditions, making outdoor relaxation challenging. While insect repellent sprays offer a quick fix, a more natural solution is to incorporate mosquito-repellent plants into your garden. Not only do these plants help deter mosquitoes, but they also add beauty and fragrance to your outdoor space.

Here are some of the best mosquito-repellent plants to consider, along with tips on how to care for them and solutions to common problems.

1. Citronella (Cymbopogon nardus)

Citronella is famous for its lemony scent, which mosquitoes detest. It's the active ingredient in many commercial repellents, but having the plant itself nearby offers a more natural defence.

Care: Citronella thrives in full sun and well-draining soil. It requires moderate watering but don’t let the roots sit in water. Fertilise monthly during the growing season with a balanced fertiliser.

Problems: Overwatering can cause root rot, and lack of sunlight can stunt growth. Ensure your plant gets at least six hours of sunlight daily.

Solution: Plant in containers for easy relocation during rainy periods to prevent soggy roots. If the plant shows signs of rot, trim away any damaged roots and move it to better-drained soil.

2. Lavender (Lavandula)

Lavender’s floral fragrance may be delightful to humans, but mosquitoes can't stand it. It’s a perfect addition to garden beds or pots and adds a lovely visual element.

Care: Lavender loves full sun and well-draining soil. It prefers dry conditions, so water sparingly once the soil feels dry. Prune after flowering to encourage new growth.

Problems: Overwatering can lead to root rot and fungal issues.

Solution: Ensure soil drains well and avoid watering too frequently. If your lavender looks unhealthy, remove soggy soil and replace it with a drier potting mix.

3. Lemon Balm (Melissa officinalis)

This mint family plant has a strong lemon scent that repels mosquitoes. It’s easy to grow and can also be used in the kitchen.

Care: Lemon balm grows best in partial shade with moist but well-drained soil. It can tolerate drought but does best with regular watering.

Problems: It can spread aggressively, taking over your garden if unchecked.

Solution: Grow lemon balm in pots to control its spread, or prune it regularly. If it becomes too invasive, divide the plant and rehome extra clumps.

4. Marigold (Tagetes)

Marigolds contain pyrethrum, a compound used in many insect repellents. Their bright blooms can add a splash of colour while also helping to keep mosquitoes at bay.

Care: Marigolds thrive in full sun and well-draining soil. Water moderately, allowing the soil to dry between waterings.

Problems: They can be affected by aphids and fungal diseases.

Solution: Treat aphid infestations with neem oil or a strong spray of water. To prevent fungal problems, ensure good air circulation and avoid wetting the foliage when watering.

5. Basil (Ocimum basilicum)

Basil’s strong scent repels mosquitoes while its leaves serve as a handy herb for your kitchen.

Care: Basil prefers full sun and nutrient-rich, well-drained soil. Regular watering is needed, especially in warmer weather, but avoid waterlogging.

Problems: Pests such as aphids and powdery mildew can affect basil.

Solution: Spray aphids off with water or use insecticidal soap. For mildew, ensure the plant gets good air circulation and water at the base rather than from above.

6. Rosemary (Salvia rosmarinus)

This woody herb has a distinct scent that mosquitoes dislike. It's also a great plant for cooking and adds structure to your garden.

Care: Rosemary prefers full sun and well-drained soil. It’s drought-tolerant, so water sparingly once established.

Problems: Overwatering can lead to root rot.

Solution: Ensure the soil is dry between waterings. If the area retains water, consider growing rosemary in pots to control moisture levels.

7. Peppermint (Mentha piperita)

The strong scent of peppermint is another natural mosquito deterrent. However, peppermint tends to spread quickly, so it’s best grown in containers.

Care: Peppermint thrives in partial shade to full sun and prefers consistently moist soil.

Problems: It can become invasive if not contained.

Solution: Grow peppermint in pots to prevent it from spreading. Regular pruning will also help manage its growth. If the leaves start to pale, it may be a sign that the plant needs more nutrients, add compost or organic fertiliser to enrich the soil.

By incorporating these mosquito-repellent plants into your garden, you can enjoy the outdoors without constantly swatting away pests. These plants not only serve as natural insect repellents but also enhance the aesthetics and fragrance of your outdoor space. Keep an eye on their care requirements and address issues like overwatering or pest infestations early to ensure your plants remain healthy.

With the right combination of these natural repellents, you can create a peaceful, mosquito-free environment to enjoy during Australia’s warmer, wetter months.