Lyla Lindsey
Lavender is a fragrant, quick-growing, and hardy perennial shrub that is a popular addition to gardens worldwide. It is known for its beautiful purple blooms and heavenly scent. In Australia, where the climate varies from temperate to subtropical, autumn is the ideal time to plant lavender, allowing it to establish strong roots before the summer heat. With its adaptability and low-maintenance nature, lavender can be easily grown in most parts of Australia, except for tropical regions such as Northern Australia. French lavender, for example, thrives in the warmer regions with hot summers and mild winters. On the other hand, English lavender is better suited to the cooler regions with mild winters. With the right variety and care, lavender can be a beautiful and fragrant addition to any Australian garden.
| Characteristics | Values |
|---|---|
| Best time to grow | Autumn |
| Climate | Temperate to subtropical |
| Soil | Well-drained, slightly alkaline, avoid heavy clay and very acidic soils |
| Sunlight | Full sun, at least 6-8 hours a day |
| Watering | Requires minimal watering once established |
| Fertilising | Once every 6 months in late winter or early spring |
| Pruning | Regular pruning is required to promote denser growth and better flowering |
| Pests and diseases | Relatively pest and disease-resistant, but susceptible to aphids, spider mites, and fungal diseases |
| Varieties | French, Spanish, Italian, Lavandin, Fernleaf, English |
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What You'll Learn
Autumn is the ideal time to plant lavender in Australia
When planting lavender in Australia during autumn, it is important to select a location in your garden that receives at least six to eight hours of sunlight per day and has well-drained soil to prevent waterlogging, especially during heavy rainfall. Lavender thrives in full sunlight and prefers slightly alkaline soil. To improve drainage and fertility, incorporate organic matter such as compost or well-rotted manure into the soil.
Lavender is a low-maintenance plant that is adapted to poor soils in dry climates. It prefers low humidity and does not do well in tropical climates. Lavender is a quick-growing, hardy perennial shrub that is a great addition to any garden, providing wonderful fragrance, abundant flowers, and a great contrast with its silvery-grey foliage.
There are several varieties of lavender that can be grown in Australia, including English lavender, which is well-suited to cooler regions with mild winters, and French lavender, which thrives in warmer regions with hot summers and mild winters. Spanish lavender, with its showy, pineapple-shaped flower heads, is a drought-tolerant variety that performs well in dry, Mediterranean-like climates.
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Lavender varieties for different Australian climates
Lavender is a hardy, low-maintenance plant that is incredibly popular to grow in Australian gardens. It is native to the Mediterranean, so lavender likes hot, dry summers and cold, wet winters. This is perfect for most of inland Australia and dry coastal areas, but it can struggle in humid coastal zones and tropical regions. French lavender, for example, is one of the more heat and drought-tolerant varieties. It can also tolerate moderate humidity and is cold-tolerant down to about -7ºC.
English lavender, on the other hand, is best suited to cool, temperate climates with mild to warm summers and mild winters. It is native to the Mediterranean and has blue-purple flower spikes, though other cultivars can be violet-blue or white-pink. It blooms profusely from mid-spring to early summer, often more than once. It is also one of the edible lavender varieties, making it a great choice for herb gardens.
For humid climates, French lavender is a good option, as it is the best species for growing in warm, humid climates in Australia. It has fragrant foliage and mildly scented flowers, with peak flowering in summer and autumn. Italian lavender is another variety that can tolerate the more humid climates of coastal areas. It has distinctive 'bunny ears' flower heads and is great for shrub borders, cottage gardens, rockeries, and hedges.
If you live in a tropical climate, lavender may struggle to grow. However, some varieties, such as French lavender, can grow in subtropical places such as Queensland. In humid areas, it is recommended to treat lavenders as annuals or short-lived perennials, as they will eventually succumb to some kind of fungal rot.
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Soil and fertiliser requirements
Lavender is a low-maintenance plant that can grow in poor soil conditions and dry climates. However, there are some soil and fertiliser requirements to consider for optimal growth. Firstly, lavender grows best in well-drained, alkaline soil. A pH level of 7-8 is ideal, and you can increase the pH of acidic soil with Yates Hydrangea Pinking Liquid Lime & Dolomite or by adding lime. Lavender is native to the Mediterranean and thrives in warm, temperate climates with hot and dry summers and cool winters. As such, it prefers low humidity and full sun exposure, receiving at least six hours of sunshine daily.
When growing lavender in pots or containers, ensure the pot has sufficient drainage holes and use a quality potting mix like Yates Premium Potting Mix with Dynamic Lifter. Keep the potting mix slightly moist, and allow it to dry out between watering sessions. Avoid overwatering as lavender does not tolerate wet roots. Established lavender plants are drought-tolerant and require minimal fertiliser. However, new plants will benefit from regular feeding with a fertiliser like OCP eco-seaweed or OCP eco-aminogro to promote growth. Flowering plants like lavender require additional potassium to promote flowering. You can use a granular fertiliser like Seasol plus Nutrients Roses & Flowers or a liquid fertiliser like PowerFeed All-Purpose including Natives. Feed the plants every one to two weeks during the growing season from spring to autumn.
Pruning is essential for lavender care and should be done after flowering, typically in autumn. Lightly prune in spring before the blooming season to encourage new growth. Avoid pruning into old wood as lavender will not reshoot from there. Deadheading, or removing spent flowers, is beneficial as it encourages the plant to produce more flowers. Additionally, applying an organic mulch like sugarcane or bark chips can help retain moisture in the soil.
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Lavender's pest and disease resistance
Lavender is a hardy plant that is resistant to most pests and diseases. However, it is not immune to all pests and pathogens. To keep your lavender plants healthy, proper care and maintenance are essential. Here are some tips to ensure your lavender has pest and disease resistance:
Preventing Pests
Lavender is known for its pest-resistant properties, and its strong scent acts as a natural repellent against mosquitoes, rodents, and moths. However, it can still attract certain pests. To prevent pest infestations:
- Regularly check your plants for early signs of pest activity.
- Encourage natural predators such as ladybirds, lacewings, and hoverflies by planting nectar-rich companion plants like marigolds, cosmos, and zinnias.
- For aphids and whiteflies, remove any infected leaves or stems.
- To deter slugs and snails, use copper barriers, diatomaceous earth, crushed eggshells, or sharp sand. Also, attract natural predators like birds, hedgehogs, and ground beetles by creating suitable habitats in your garden.
- For caterpillar control, use Bacillus thuringiensis (Bt), a naturally occurring soil bacterium.
Preventing Diseases
Lavender thrives in dry, well-drained conditions and is susceptible to root rot and fungal diseases in excessively wet environments or with poor drainage. To prevent diseases:
- Ensure your lavender is planted in well-drained soil. Amend the soil with sand, gravel, bark, or peat moss if necessary.
- Avoid overwatering, especially during wet periods.
- Space plants adequately to ensure proper airflow.
- In humid climates, deeply aerate the soil and increase plant spacing.
- To treat root rot, remove damaged tissue and apply organic fungicides to the soil.
- To prevent Xylella, a disease caused by the bacteria Xylella fastidiosa, maintain healthy plants and well-drained soil. Encourage beneficial insects like parasitic wasps and dragonflies to feed on the bacteria and sap-sucking pests that spread it.
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Pruning techniques
Pruning your lavender plants is essential to maintaining their health and encouraging new growth. Here are some pruning techniques to keep your lavender plants looking neat and tidy:
Timing is key: The best time to prune lavender is in the spring, while the plant is still in winter dormancy or once you notice green growth, but before bud formation. Pruning in spring will help prepare the plant for new growth. Light, cosmetic pruning during the summer and early fall is also fine, but heavy pruning should be done in the spring. Avoid pruning in the fall in northern climates, as this can kill the plant.
How much to prune: When pruning lavender, it is recommended to prune up to one-third of the branch's length. Do not prune more than one-third of the branch in a year. If a branch is dead or mostly dead, you can prune it back to the core. To identify if a branch is dead, you can perform the snap test by trying to snap the branch from the tip down. If the branch becomes pliable at a certain point, that is where it is alive. Alternatively, you can try the scratch test by scratching the branch with your fingernail; if you see green, it is alive.
Encouraging regrowth: Regular pruning will help encourage new growth and keep your lavender plant from becoming too bushy. Light pruning is best after the first harvest, followed by heavier pruning during the summer or fall. Pruning gives the plant time to regenerate and removes unsightly woody growth.
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Frequently asked questions
Autumn is the ideal time to plant lavender in Australia, allowing it to establish strong roots before the summer heat.
Lavender is a low-maintenance plant that is adapted to poor soils in dry climates. It thrives in full sun, well-drained soil, and hot, dry climates. It prefers slightly alkaline soil and neutral to low humidity.
Some common lavender varieties suited to the Australian climate include English lavender, which is well-suited to cooler regions with mild winters, and French lavender, which thrives in warmer regions with hot summers and mild winters. Other varieties include Spanish lavender, Italian lavender, and Lavandin, a hybrid with fragrant flowers.
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