Taking care of garden plants without using harsh chemicals is something that more and more people are considering. If you have rose bushes, aromatic plants, flowerpots on the balcony or a small urban gardenI'm sure you've sometimes found chewed leaves, bugs running around, or strange stains that you don't quite know where they came from.
Before reaching for the first bottle of pesticide at the supermarket, it's worth knowing all the alternatives to homemade pesticides and insecticides You can prepare them at home with simple ingredients like garlic, milk, soap, natural oils, or tomato leaves. They work very well against many pests, are environmentally friendly, and, when used wisely, help keep your flowers healthy without polluting the environment.
Why opt for homemade pesticides in your garden
In any garden or flowerbed, sooner or later, they appear Insects, fungi, and some bacteria attack leaves, stems, and flowersNot all of them are harmful, but when a species explodes and becomes a pest, your plants pay dearly: buds that fail to open, leaves with holes, deformed blossoms, or plants that simply collapse.
The commercial pesticides sold in many stores are, for the most part, synthetic chemicals with potential toxic effectsThe World Health Organization warns that they can affect the nervous, immune, or reproductive systems, and may even be linked to certain types of cancer if not managed properly. Therefore, they should be reserved as a last resort and only used when there is no other alternative.
Long before these products existed, Farmers already used home remedies to control insects, fungi, and other pests.Using infusions, macerations, soaps, oils, and repellent plants, they were able to protect crops and maintain acceptable harvests. This wisdom remains valid today and is perfect for a home garden or a small hobby vegetable patch.
The key is to understand that a homemade pesticide is not a magic wand, but one more tool within an ecological management strategyObserve carefully what is happening, act only when there is a significant level of damage, alternate preparations and, whenever possible, strengthen the health of the plant with good watering and a rich substrate.
How to detect pests in flowers and act in time
Before preparing any homemade formula, it is advisable to take a moment to look at it calmly. Identify the specific problem you have with your flowers It makes the difference between finding the right remedy or wasting time.
If as you approach you see holes, more or less large, in the leavesIt's common to find caterpillars, beetles, slugs, and snails feasting. If there are only a few, you can pick them up by hand (wear gloves if you're hesitant) and leave them away from your plants. Only when the infestation gets out of hand is it worth preparing a specific homemade pesticide.
When what you notice are Leaves that yellow, turn brown, or become unevenly discoloredYou may be dealing with a mite infestation like the Red spider or small sap-sucking insects. These insects suck the sap, weakening the plant tissue until it stops growing and may die. Spray preparations that thoroughly cover the undersides of the leaves, and in many cases the soil as well, work very well here.
Another typical sign is the presence of whitish, yellowish or blackish spots with a dusty or velvety appearance on leaves and stems. It is usually caused by fungi such as powdery mildew, downy mildew, or rust, which appear mainly in hot and humid conditions. In these cases, in addition to treating them, it is important to avoid over-wetting the foliage when watering and to remove severely affected leaves as soon as possible.
In all cases, it is advisable to apply these remedies. only when a high insect population or several damaged leaves are observedUsing them "just for the sake of using them" can disrupt the small ecosystem of the garden and eliminate beneficial insects, achieving the exact opposite of what is desired.
Homemade insecticide spray with garlic: a foolproof classic
One of the best-known remedies is the garlic spraybecause garlic contains sulfur compounds with a very strong odor that are repellent to many insectsIt doesn't poison so much as it bothers them, so the insects tend to stay away from the treated plants.
A simple way to prepare it is to blend a whole head of garlic in a blender or food processor along with a few cloves (the spice) and two glasses of water. Beat thoroughly until you have a very smooth paste.
That mixture is left Let it sit for about 24 hours so that the water becomes fully infused with the aromatic compounds.After that time, add about 3 liters of clean water to the preparation, preferably without chlorine or left to stand for at least a couple of days.
The resulting solution is transferred to a sprayer and applied directly to the leaves, focusing on the lower part, which is where aphids and other tiny insects usually hide. This spray is especially effective against aphids.although it also bothers other small suckers.
If you want to further enhance the effect, you can combine the garlic with mild soap, following a similar process to other garlic and soap recipes. In any case, it's important not to spray in direct sunlight to avoid burning the wet leaves.
Garlic and soap pesticide: double action against insects
Garlic alone is already a great ally, but when combined with soap you get a homemade pesticide with a more powerful and persistent effect, ideal for when the infestation is quite established.
The first step is to make a garlic puree with distilled waterPeel the cloves from a head of garlic, place them in a blender, and add a glass of distilled water (or, if unavailable, boiled and cooled water). Blend for about two minutes, until you obtain a smooth paste.
Next, the following is added Add the remaining water until you reach approximately 700 mlThen it's whisked again for another two minutes to ensure the garlic is completely distributed throughout the liquid. The goal is to obtain a very watery solution, without any bits, that won't clog the spray bottle.
This mixture is then transferred to a glass jar with a lid and added mild liquid soapIt can be liquid hand soap or a stain-removing soap that doesn't contain perfumes or harsh additives. Stir carefully to avoid creating excessive foam and close the container.
It's best to leave the mixture. between 12 and 24 hours of restThis allows the sulfur from the garlic to thoroughly infuse the solution. After that time, strain it if necessary and transfer it to a spray bottle. Simply spray the affected plants, covering both sides of the leaves. The garlic repels insects, and the soap helps to dissolve the waxy coating of many of them, thus enhancing their elimination.
Homemade fungicide with milk and baking soda
Fungi are one of the biggest enemies of flowers, especially in summer, when they coincide high temperatures and abundant humidityUnder these conditions, white spots like powder (powdery mildew), yellowish areas between veins (downy mildew), or orange or brown spots (rust) appear out of nowhere.
A very useful and easy-to-prepare fungicide combines water, milk and baking sodaThe basic ratio is to mix 8 parts water with 2 parts milk; that is, for a total of one liter, 800 ml of water and 200 ml of milk. It is recommended to use skimmed milk, because what is important are the salts, amino acids, and, above all, the lactic acid, not the fat.
The recipe starts with water, preferably rainwater, or tap water that has been left to stand. Let it sit for a couple of days to allow the chlorine to evaporate.The milk is added to the water and mixed well. Then, about 20 grams of sodium bicarbonate are added per liter of the mixture and stirred until dissolved.
This homemade fungicide is transferred to a sprayer and used two days in a row, preferably at sunset or after a stormwhen the plants are not receiving direct sunlight. It can then be applied preventively approximately every two weeks.
It is especially interesting for combat powdery mildew, downy mildew and rust on leaves and stemsIn addition to inhibiting fungi, bicarbonate has a disinfectant and slightly healing effect on small wounds in plant tissue.
Organic insecticide with tomato leaves
Tomato plants store a natural defense in their leaves: they are rich in alkaloids that act as repellents against various insectsHarnessing this effect in the form of a homemade spray is as simple as making an aqueous maceration.
To prepare it, they are filled two cups with chopped tomato leavesThe plants, preferably healthy and without any signs of disease, are placed in a container. They are covered with water and left to soak for at least one night to allow the alkaloids to transfer to the liquid.
The next day, that maceration is diluted in two more glasses of clean water and pour it into a spray bottle. Shake it a little before using, and you'll have a spray ready to apply to your flowers and vegetables.
This homemade preparation is especially suitable for Aphids, worms, and caterpillars that attack tender leaves and shootsHowever, caution is advised, and it should be kept away from pets such as dogs and cats, as these alkaloids can be toxic to them if ingested.
In addition to using it when the pest is already present, it can be applied sporadically during periods of higher risk, for example at the beginning of spring, to deter the first invaders.
How to use eggshells as a barrier and fertilizer
Eggshells are one of those kitchen scraps that you feel bad throwing away, and rightly so: They provide calcium to the soil and help keep certain invertebrates under control. that devour leaves and tender shoots.
One simple way to take advantage of them is Crush them well, until you obtain small pieces or even a coarse powderThis material is spread around the base of the plants, forming a kind of protective ring over the substrate.
For snails and some caterpillars, crossing a strip of sharp debris is uncomfortableTherefore, they often turn back before reaching the stem. It's not a foolproof barrier, but it is an additional aid within the set of protective measures.
At the same time, as the shells decompose, They release minerals that enrich the soilIt is a way to recycle organic waste and improve garden soil in a very economical way.
It's a good idea to replace the layer of husks periodically, especially if it rains frequently or they disintegrate quickly. You can also lightly mix them into the top centimeter of substrate to prevent them from being blown away by the wind.
Natural control of snails and slugs on flowers
Snails and slugs are, for many gardeners, the most desperate pest in flower beds and newly planted shootsThey are hardly seen during the day, but at night they devour everything tender they can find: dahlias, hostas, pansies, lettuce…
Before applying anything, it is advisable to assess whether they have truly become a plague. If there are few specimens and the damage is minimalOften, simply collecting them by hand in the late afternoon and moving them to a less problematic corner of the garden is enough. However, if the damage is serious, you can use several home remedies.
One of the simplest is scatter very cold and dry wood ash around the plants. The texture and dehydration it causes in the soft bodies of these animals makes them think twice before crossing it. However, it must be replenished after heavy rains or watering.
Another well-known trick is to use beer as baitIf you bury a jar or container in the ground, leaving the rim flush with the earth, and fill it with beer, snails and slugs will be attracted by the smell, crawl inside, and many will drown. It's an effective, albeit somewhat drastic, method, and it's advisable to check the containers frequently.
You can also opt for the caffeine diluted in water at a concentration close to 2%Spray it around the flowers. Studies suggest it acts as a toxin to snails and slugs, significantly reducing their numbers. It's important to carefully adjust the dosage to avoid harming the rest of the soil ecosystem.
Homemade pepper spray for persistent pests
Pepper, with its spicy flavor and distinctive aroma, can become an interesting repellent against “tough” insectsIn spray format, it serves as support when other gentle formulas fall short.
To prepare it, simply place it in the blender a good handful of pepper (it can be black or cayenne) and two cups of waterBeat at maximum power for about two minutes, until the water takes on a dark and spicy hue.
The mixture is left in macerate overnight to allow the active compounds to concentrate properlyThe next day, it is filtered through a cheesecloth or fine sieve to remove solid remains, and another glass of water is added to slightly reduce the intensity.
This preparation can be used to spray the affected plants, avoiding over-spraying and, above all, not applying it in strong winds or near the eyes. It should not be used continuously, but only at specific times. where other recipes don't work.
As with other homemade pesticides, it's a good idea to test it first on a small area of the plant and wait 24 hours to check for any sensitivity reactions before treating the whole plant.
Onion insecticide against red spider mites, whiteflies and aphids
Onions, like garlic, contain sulfur compounds with repellent and mildly insecticidal propertiesTherefore, it can be a good option against common small pests in ornamental gardening.
Basic preparation consists of Blend three onions with water in a blender until you obtain a very liquid puree. This mixture is poured into a jar with more water and left to sit overnight, so that the water fully absorbs the intense aroma of the onion.
The next day, the solution is filtered and ready to be placed in a sprayer. Applied to the plants, It is useful for controlling spider mites, whiteflies, and aphids.among other small insects that feed on sap.
As always, it is recommended to use it preferably early in the morning or at dusk, when the sun is not so strong and the risk of burns on wet leaves is reduced.
In small gardens or balconies, where plants are usually very close together, alternating the use of onion, garlic, and soap helps prevent pests from becoming accustomed to just one type of preparation.
Citrus orange oil for ants and cockroaches
Citrus essential oils, such as orange oil, have a strong repellent effect on antscockroaches and other crawling insectsIn addition, their smell is usually pleasant to us, something that is appreciated when they are used on terraces or patios.
A simple recipe involves mixing three tablespoons of organic liquid soap with about 30 ml of orange oilTo that base, approximately four liters of water are added, stirring well so that the oil is dispersed as much as possible in the liquid.
The preparation is applied with a sprayer. on areas where ants travel, corners where cockroaches take refuge, or directly on surfaces where they can access your plantsIt's not a poison in the conventional sense, but it does manage to scare them away and make the surroundings less attractive.
Since it is an oil-based product, it should not be used excessively on very delicate leaves, and it is always a good idea to do a small test beforehand to check for any damage.
Additionally, you can strengthen protection by properly sealing cracks, moving flowerpots, and controlling food scraps that might attract them to your garden or balcony.
Natural insecticide made from neem oil and potassium soap
Neem oil has become very popular because it acts as insecticide, repellent and somewhat mild fungicide, with a fairly environmentally friendly profile when used correctly. If combined with liquid potassium soap, it creates a very complete triple-action solution for ornamental plants and organic crops.
There are commercial kits that already include neem oil, potassium soap, a dropper pipette, an empty spray bottle, and even a sticker for labeling the container. With these quantities, you can prepare up to 10 liters of mixture, enough for many refills of the sprayer.
The approximate proportions for a 400ml bottle are 4 ml of neem oil, 8 ml of potassium soap and 388 ml of waterIdeally, use demineralized or filtered water to prevent salts from interfering with the mixture. First, add the neem oil and soap to the container, then fill with water.
Once the bottle is full, it is sealed tightly and... Shake vigorously to combine all componentsBefore each use, it is advisable to shake again, as the oil tends to separate over time.
The application is done at dusk, spraying all the foliage, and especially the underside of the leaves, where many pests hide. It can be used every 5-7 days while the problem persists, or as a preventative measure during times when aphids, mealybugs, whiteflies or mild fungi usually appear.
Potassium soap, diatomaceous earth and other ecological allies
If you prefer not to complicate things by preparing long formulas, you always have the option of resorting to ready-made or very easy-to-use organic productswhich fit well into a sustainable gardening approach.
Potassium soap, by itself, is a great leaf cleaner and a mild insecticide It works well against aphids, whiteflies, and other soft-bodied insects. Dissolved in water and sprayed, it softens the insect's protective layer, making it easier to remove, while also washing away honeydew and dirt.
Diatomaceous earth is another interesting resource: it is a very fine mineral powder with microscopically sharp edgesFor insects like ants, small slugs, or certain beetles, it's quite uncomfortable and can cause dehydration. Sprinkle it dry onto the substrate or in areas where they travel.
Neem oil itself, even without sophisticated combinations, can be used as targeted treatment on leaves and stemsAlways respecting the manufacturer's recommended dosages. This allows for the control of many pests without resorting to synthetic insecticides.
In addition to these products, it is very useful play with companion plants such as calendula or basilwhich help to repel whiteflies and other unwanted visitors if placed around the most sensitive species.
Other home remedies against common pests
In addition to the main preparations, there are a number of complementary remedies that can make a difference in an organic garden. Cilantro, for example, works very well against certain species of mites..
To use it, they are boiled Soak the cilantro leaves in water for about 10 minutesIt is left to cool, strained, and transferred to a spray bottle. Spraying this infusion on the affected plants reduces the presence of mites and helps the plant recover.
Another simple ally is the vegetable oil mixed with pure liquid soapBy combining two cups of oil with half a cup of soap and shaking until a whitish emulsion is obtained, a base is created that is then diluted with water and sprayed on plants. It works especially well against aphids, mealybugs, caterpillars, and some mites.
La fresh unpasteurized cow's milk It can also be used in another way: by mixing half a cup of milk with four cups of flour and about 20 liters of water, you get a preparation designed to kill insect eggs attached to leaves.
The nettle, so irritating to the touch, is both a powerful, mild pesticide and a good fertilizerBy mixing about 100 grams of fresh nettle with 10 liters of water and letting it sit for four days, a slurry is generated that can be used to strengthen the soil and act against aphids.
Natural tobacco, finally, provides nicotine, a compound highly toxic to many insects. Mixing 60 grams of tobacco with one liter of water and 10 grams of natural soapBy applying the solution once a week for a couple of months, you can keep the red spider mite at bay, although its use should be prudent due to the toxicity of the active ingredient.
Lavender, calendula, and basil: plants that protect other plants
Beyond sprays and liquid mixtures, there is another very interesting strategy: using some plants as a living shield against pestsPlanted along the edges of the garden or among flowerpots, they help to confuse, repel, or divert the most annoying insects.
Lavender, for example, is a a great ally for repelling antsBy preparing an infusion with about 300 grams of fresh lavender leaves in a liter of water, letting it cool and then spraying it on the attacked plants, the ants lose interest in that area.
Calendula and basil, planted around other species, act as natural barrier against whitefliesIts smell and volatile compounds are unattractive to this insect, which will tend to look for other places to settle.
Combining these species with flowers that attract beneficial insects (such as ladybugs or lacewings) encourages ecological balance in the gardenso that pests have a harder time spreading uncontrollably.
In the end, the most effective approach is usually to add small measures: a little nettle manure, some potassium soap, physical barriers of eggshells, and a good planting design with protective aromatic plants.
Caring for flowers and the vegetable garden with homemade preparations and organic products involves observing, testing and adjusting, but it also allows you to enjoy a more vibrant and healthy garden. With these natural insecticides and pesticides, applied only when necessary and in moderationYou can keep aphids, caterpillars, fungi, slugs and the like at bay, without sacrificing a more respectful environment for you, your family and the environment.
