How to prepare nettle mash for garden and garden plants

In this post we will tell you how you can make a biopreparation with nettle to prevent pests in your orchard or garden. This homemade preparation is simple to make and apply and can be very useful if you want to opt for environmentally sustainable pest management.

What is nettle mash good for?

This nettle mash is used against pests and diseases and as a fertilizer.

The macerate or ferment of nettle , Urtica dioica , can bring great benefits to plants in orchards and gardens. Although we often call it slurry , the truth is that slurry is called the liquid obtained from the urine of farm animals such as cows or manure.

In this article we will tell you how you should prepare it so that you can take advantage of it in your orchard or garden. Also, at the end of the article I invite you to watch a video about the qualities of nettle, it is very interesting how beneficial this plant is!

We also advise you which organic seeds to use , the best planters, growing boxes and tables for your garden and essential books to learn everything about organic gardening .

Nettle is a plant with exceptional medicinal properties , and the ancients used it in numerous home remedies to improve or maintain health.

But beyond the uses of this plant in phytotherapy, in the orchard or garden the nettle can help us to prevent pests in an ecological way and also as a fertilizer , providing the soil with nitrogen, iron, phosphorus, potassium, calcium or silicon.

And to think that some still consider this plant as a weed

How does the nettle mash work?

This ferment will act by strengthening the natural defenses of the plant against future diseases and pests.

Something that will come in handy at specific times of the year such as spring and summer.

The nettle macerate is easy to prepare and your plants will appreciate it, yes, I must warn you that it smells a bit bad.

How to prepare the nettle macerate


  • Fresh nettle (between 400 and 500 grams)
  • Gloves
  • Pair of scissors
  • 2 buckets or drums and a lid (with a minimum capacity of 10 liters)
  • Pair of scissors
  • Water
  • A wooden stick or utensil
  • Strainer or filter


When cutting and handling nettles you should wear gloves to protect yourself from the hives they produce.

  1. Cut the nettles and then cut the leaves in half and pour them into the bucket. Then add the water to fill the bucket.
  2. Cover the bucket or drum and leave it in a cool, dark place. We will leave it like that for a minimum period of two weeks and a maximum of three.
  3. We must move the mixture with a stick or wooden utensil every three days.
  4. After the time indicated above, we gradually strain the solution.

When using it to fight pests and diseases or as a compost or liquid fertilizer, dilute a part of the mash by 5 of water.

Read more articles about organic garden

How to apply nettle macerate

* As I said at the beginning of the article, nettle is excellent for preventing and combating very common pests both in orchards and gardens. Pests such as aphids and mites such as spider mites , but it also helps us prevent and combat fungi such as mildew . For prevention we will use it for a week applying it every other day once a day, in the late afternoon.

To use as a treatment for pests or diseases we will use it during the same period every day at the last minute. We can apply by spray by spraying the aerial parts of the plants and also use as irrigation water.

* This ferment of nettle is also very beneficial as a foliar fertilizer (we put it in a container with spray or spray and we throw it to the aerial part of the plants in the late afternoon) or also as a liquid fertilizer that we mix with the water of irrigation, at the ratio of one part of nettle macerate to five of water. This nettle fertilizer will stimulate the growth of plant roots, promote flowering and can be used to water seedlings because it stimulates the germination process .

How should you store the leftover mash and for how long can it be stored?

Keep this biopreparation in a dark bucket or drum, in a cool place away from light and you can use it for a month.

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