Leslie Massey
Mint is a popular herb to grow in Australia, thanks to its ability to thrive in a wide range of climates. However, it is susceptible to a variety of pests, including worms, caterpillars, cutworms, slugs, snails, aphids, thrips, and even rabbits. If you're finding that something is eating your mint, it's important to identify the culprit and take appropriate action to prevent further damage.
| Characteristics | Values |
|---|---|
| Common pests | Caterpillars, worms, cutworms, leafrollers, slugs, snails, aphids, spiders, flies, moths, squirrels, blue jays, centipedes, sawfly larvae, leaf miners |
| Pest damage | Leaves with oval holes, scalloped bite marks, stripped leaves, bite marks |
| Pest control | Netting, pyrethrum, chilli, soapy water, garlic, pepper, natural insecticide soap, caffeine mixture, Diatomaceous Earth, animal manure, insecticides, Bacillus thuringiensis |
| Mint type | Spearmint, peppermint, eau-de-cologne mint, apple mint |
| Mint appearance | Bright green, elongated, pointed end, pink to lilac flowers |
| Mint growth | Well-drained, damp, partial shade to full sun, 25°C days, 15°C nights, pH 6.0-7.5 |
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What You'll Learn
Caterpillars, worms, and other insects
Mint plants are susceptible to a wide range of pests, including caterpillars, worms, and other insects. If you're finding that something is eating your mint plants, it could be one of many critters.
Caterpillars
Caterpillars are a common culprit when it comes to mint plant damage. They can be hard to spot, as they are often green and blend in with the leaves. To get rid of them, simply pluck them off the plant. To prevent caterpillars from munching on your mint, you can try covering the plant with netting to keep the butterflies out or plant something nearby that is more attractive to butterflies.
Worms
Worms, such as cutworms, can also be a problem for mint plants. Cutworms are nocturnal feeders, hiding in the soil during the day and coming out at night to feed on the plant. They can be identified by their tendency to curl into a C-shape when disturbed. To get rid of cutworms, you can dig around the base of the plant to find and remove the larvae. You can also clean up any plant debris to remove their hiding places and spread diatomaceous earth around the base of the plant, which will cut the worms if they try to crawl over it.
Other Insects
In addition to caterpillars and worms, other insects that may be eating your mint include aphids, thrips, slugs, snails, and even small flying bugs. To get rid of these pests, you can try using natural insecticides such as soapy water, garlic and chilli sprays, or a mixture of boiled garlic, rhubarb, mint, onions, cayenne, ginger, and horseradish. For soft-bodied insects like aphids, a mixture of plant-based soap and water in a spray bottle can be effective.
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Natural insecticides
Mint is a popular plant in Australian gardens due to its ability to grow in a wide range of climates. However, it is susceptible to damage from various insects and pests. To protect your mint from these threats, you can use natural insecticides that are safe for your family and the environment. Here are some detailed, direct, and instructive tips on using natural insecticides to safeguard your mint:
Preventative Measures:
Firstly, the best defence is a good offence. Take preventative measures to create an unfavourable environment for pests. Mint thrives in moist, well-drained, nutrient-rich soil. Ensure your mint plants are well-nourished and healthy as they are more resistant to pests. Avoid excessive nitrogen, which can promote foliage growth at the expense of flavour and aroma. Mint prefers partial shade in hotter climates, so consider providing some shade to prevent leaf scorching.
Physical Barriers:
Use netting or mesh over your mint plants to create a physical barrier against larger pests, such as butterflies and caterpillars. This simple measure can effectively deter these pests from accessing your mint.
If you're dealing with smaller pests, natural insecticides can be a safe and effective solution. Peppermint oil, the concentrated essence derived from peppermint plants, is a potent insect repellent and killer. It has been used for decades to control various insects, including spiders, ants, cockroaches, and rodents. You can purchase ready-to-use peppermint oil insecticides, such as Mighty Mint, or make your own spray at home.
Homemade Mint Spray:
To make your own natural insecticide, blend one medium onion, four cloves of garlic, two cups of mint leaves (or pure peppermint oil), two tablespoons of cayenne pepper, and two tablespoons of liquid castile soap. Strain the mixture and add water to make one gallon of spray. Apply this spray to affected plants once or twice daily. Alternatively, you can place dried mint leaves in cloth bags and hang them around your garden to repel insects.
Companion Planting:
Companion planting is another natural pest control strategy. Planting certain flowers, herbs, or vegetables alongside your mint can deter specific pests. For example, marigolds help deter cabbage loopers, a common pest of mint. Additionally, consider planting sacrificial plants that are more attractive to pests than your mint, such as nasturtiums.
Integrated Pest Management:
Finally, adopt an integrated pest management approach. Hand-pick larger pests like caterpillars and snails. Remove infected leaves and apply organic fungicides, such as copper or sulphur, at the first sign of fungal diseases like rust or anthracnose. Remember, not all insects are pests; some, like ladybugs, spiders, and wasps, are beneficial and can help control pest populations.
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Deterring animals
Mint is a popular herb to grow in Australia, but it can be frustrating when critters start eating your plants! Here are some tips to deter animals from eating your mint:
Identify the Pest
First, it's important to identify what is eating your mint. Common pests include caterpillars, worms, cutworms, slugs, snails, aphids, thrips, and even bunnies. If you're not sure, look for telltale signs such as scalloped bite marks, which indicate caterpillar or worm damage, or oval holes, which could be slug damage. You can also dig around the base of the plant to look for cutworm larvae, which are 1-2 inches (2.5-5 cm) long and curl into a C-shape when disturbed.
Remove Hiding Places
Keep the area around your mint plants clear of debris, as this provides hiding places for pests like worms and snails. Removing foliage will also reduce the amount of cover for pests like caterpillars.
Barriers
Physical barriers can be an effective way to deter larger pests like rabbits. Try using a fence or mesh to enclose your mint plants. For smaller pests like caterpillars and aphids, a fine mesh net can prevent them from reaching your plants.
Diatomaceous Earth
Diatomaceous earth is a natural, non-toxic powder that can be sprinkled around the base of mint plants. It has sharp edges that will cut insects as they crawl over it, deterring slugs, snails, and worms.
Natural Insecticides
There are several natural insecticides that can be used to deter and kill pests on mint plants. One option is to create a garlic and chilli spray by boiling a mixture of garlic, rhubarb, mint, onions, cayenne, ginger, and horseradish, then straining and pouring the liquid into a spray bottle. Alternatively, you can mix plant-based soap with water in a spray bottle and spray it on soft-bodied insects like aphids, caterpillars, and parsley worms. This will cause dehydration and death.
Bacillus thuringiensis
If caterpillars are your main problem, Bacillus thuringiensis is a bacterium that will kill them with little to no effect on other wildlife. However, you must cut your mint plants back to the ground before applying this treatment.
Companion Planting
Companion planting involves planting certain plants together to deter pests. Try planting something nearby that is more attractive to butterflies and caterpillars, such as parsley or dill.
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Mint plant care
Mint is a hardy perennial plant that is easy to grow and can be grown indoors in containers or outdoors in the garden. It is an aggressive spreader, so it should be kept separated from other plants to prevent it from consuming nutrients and overgrowing them. When planting in the ground, space mint plants 18 to 24 inches apart. It is also recommended to add edging around the planting area to discourage the mint from spreading too far.
Mint grows best in damp, moist areas with well-drained soil and partial to full sun. The ideal temperature for mint is between 65°F and 75°F (18.3°C and 23.8°C), with warm sunny days (25°C) and cool nights (15°C). Mint prefers fertile soil with a pH between 6.0 and 7.5 and requires plenty of water to keep the soil moist, although waterlogged soil can rot the roots. Feed mint plants with a water-soluble plant food or a balanced nutrition program such as animal manure.
Mint can be propagated vegetatively or by seed. Vegetative propagation involves digging up plants in late winter to early spring, dividing them into runners with roots, and replanting. This prevents the plants from becoming root-bound and prone to disease. Mint can also be grown from cuttings, with small white or purple summer-blooming flowers that attract bees, butterflies, and other pollinators.
To control the spread of mint, it is often grown in pots or containers. Choose a container that is at least 10 to 12 inches wide to give the plant room to grow, with proper drainage to allow the water to drain out completely. Fill the pot with a mix of aged compost and soil to improve soil texture and nutrition. Keep the pot in a sunny location and turn it every week or two to keep roots from escaping through the drainage holes.
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Mint varieties
Mint is a prostrate culinary herb from the Mediterranean, Europe, Asia, and Australia. It is part of the mint family (Lamiaceae), which includes other herbs like thyme, rosemary, basil, sage, lavender, pennyroyal, and thyme. Mint is commonly used in herbal teas, as a food flavouring, and as a medicinal herb.
There are 25 species of mint, which can be propagated either vegetatively or by seed. The most common types of mint are spearmint, peppermint, eau-de-cologne mint, and apple mint. Spearmint is the most common mint grown commercially in New South Wales and in home gardens. It has bright green, smooth, elongated leaves with pointed ends. The flowers are pink to lilac and grow in clusters at the end of the stems.
Peppermint, on the other hand, has a stronger flavour and aroma due to its higher concentration of essential oils. It is often used in herbal teas and as a flavouring agent in foods like candies and ice cream.
Other less common varieties of mint include Moroccan mint, Vietnamese mint, ginger mint, pineapple mint, and chocolate mint. These mints offer unique flavours and aromas, making them perfect for culinary experiments or creating signature herbal teas.
Mint is typically grown in moist, well-drained soil with plenty of sun and warm temperatures. It requires a well-balanced nutrition program, and animal manure can provide a good balance of major and minor elements. Mint is susceptible to pests like loopers, leafrollers, slugs, snails, and aphids, as well as diseases like mint rust, so proper care and management are necessary to ensure a healthy crop.
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Frequently asked questions
There are many pests that like to eat mint plants, including caterpillars, worms, cutworms, leafrollers, slugs, snails, aphids, and even bunnies.
Caterpillars are green to blend in with the leaf. They leave the veins of the leaf intact.
You can pluck them off by hand or wash the mint before use so they don't end up in your food. Netting over your mint may help to keep the butterflies out, or you could plant something nearby that is more attractive to butterflies.
Clean out any plant debris, ridding the worms of a place to hide. Then spread diatomaceous earth around the base of the mint plants. The sharp, diatomaceous soil will cut the insects if they try to crawl over it.
