6 Ecological fungicides against fungus in the garden

Last updated on October 23rd, 2023 at 08:19 pm

When the heat arrives is one of the delicate moments that can happen to the plants of our garden. It is a very favorable time for the development of fungi, and especially if there are storms, as there will be moisture too, so we will need these ecological fungicides to prevent to cure fungi.

6 Ecological fungicides against fungus in the garden
Root and collar rot caused by fungi

Today we will talk about several types of totally natural ecological fungicides, which you can make yourself because they are very simple, and that will help you prevent the most common fungal diseases in the garden.

Sodium bicarbonate

6 Ecological fungicides against fungus in the garden

It is an effective fungicide both to prevent the appearance of fungi and to eliminate them if they have already appeared, as long as they are not in a very advanced stage. It is effective against mildew, powdery mildew, anthracnose and blight.

Preparation: Dissolve 2 small spoonfuls of sodium bicarbonate in 1 liter of water. A small spoonful of natural or neutral soap can be added to this.

Use: spray the preparation, twice a day for a week, on the affected areas or all over the leaves. Continued use is required to ensure its effectiveness.

6 Ecological fungicides against fungus in the garden
Powdery mildew on leaves


Previously we have talked about the properties of coffee in the garden, and one of them is that it can prevent fungi in general.

Preparation: let the coffee grounds dry, this can be done by leaving them to dry in the sun for a week.

See also  Plastic Composters: Advantages And Disadvantages

Use: spread the grounds around the plant, so that they absorb the humidity, it is recommended to spread them on top of mulching or plastic, so that it does not acidify the soil in the long term.

Bordeaux broth

6 Ecological fungicides against fungus in the garden

Although some processed products are used for its preparation, but it is considered as an ecological fungicide, since it is environmentally friendly and its mineral component (copper sulfate) is used in the same way as it is extracted from the natural environment.

Preparation: at 1% concentration of the active ingredient, 10 grams of copper sulfate are mixed in half a liter of water, and 10 grams of quicklime are mixed with another half liter of water in a separate container. Each mixture has to be stirred very well until it has dissolved correctly and let it stand for 3 hours, then they have to be mixed but very important pouring the copper sulfate solution in the lime solution, and not the other way around because it could produce toxic gases, this mixture will be done slowly. Once we already have the final solution we must measure its pH, which must be between 6-7, if it is not between these values and it is smaller than 6 it will be necessary to add something more of lime.

IMPORTANT: The ecological fungicides prepared with quicklime or copper sulfate irritate the skin and eyes, so they must be handled with extreme care.

Use: The final solution is sprayed on the plant in moderation, all over the plant.

Anti-fungal preparation made with milk

Surprisingly, this is a very effective fungicide against the most common fungi, such as mildew, botrytis, rust, etc., due to the salts and lactic acid it contains.

See also  How Do You Renovate A Neglected Lawn?

Preparation: To obtain 1 liter of this fungicide, mix 700 ml of water with 300 ml of milk, you can add 10 grams of baking soda, this is optional.

Use: Spray all over the plant, both on the top and the underside.

Garlic and onion infusion

Both garlic and onion have insecticidal and fungicidal properties. They can be used together or separately. It is used as a preventive measure against common fungi and is also a good insecticide.

6 Ecological fungicides against fungus in the garden

Preparation: For 750 ml of water add a quarter of an onion and two heads of garlic. Let it macerate during the whole night or 24 hours. Then bring it to a boil, strain it so that only the liquid part remains and let it cool.

Use: spray all over the leaves, once a day and every 10 days, especially when the plant is young.

Horsetail (Equisetum arvense)

One of the many benefits of horsetail is its great effectiveness against fungi. It is one of the most effective remedies, especially it is very useful against rust.

Preparation: it is made as an infusion. To do this, the plant should be left to soak overnight (it is recommended to use a medium-sized plant per liter or liter and a half of water). The next day it is infused, i.e. boiled for 2-3 minutes, the remains are strained and allowed to cool for use.

Use: with the resulting infusion is sprayed on the leaves, once a day. Its repeated use will be more effective.

One of the great advantages of using all these types of fungicides is that they are very economical and easy to prepare all of them. All of them should be used at times of the day when there is no sun, because they are natural and degrade quickly. In addition, homemade fungicides should be used soon, within 3-4 days after their preparation so that they do not lose their properties.

See also  Rejuvenate Lavender - How To Proceed?

If you want to know other preparations and preventive actions against fungi I leave you this other link with more ideas of organic fungicides to fight against fungi in the garden.


  • James Jones

    Meet James Jones, a passionate gardening writer whose words bloom with the wisdom of an experienced horticulturist. With a deep-rooted love for all things green, James has dedicated his life to sharing the art and science of gardening with the world. James's words have found their way into countless publications, and his gardening insights have inspired a new generation of green thumbs. His commitment to sustainability and environmental stewardship shines through in every article he crafts.