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All Things Garden,  Compost

How to Make Stinging Nettle Fertilizer Tea to Feed Plants

It is almost spring, and that means the nettles are on their way! Do stinging nettles grow rampantly in your area? If so, you’re in luck. Because that means you have an abundance of free and fabulous fertilizer – right at your fingertips! Uh, gloved fingertips that is. Read along to learn about the benefits of stinging nettle, how to comfortably harvest it, and how to turn it into homemade fermented nettle fertilizer tea. The other plants in your garden will thrive in return!


What is Stinging Nettle? 

Stinging nettle (Urtica dioica, also known as common nettle or nettle leaf) is an herbaceous perennial plant. It usually pops up each spring, and easily spreads after flowering and going to seed. Nettle is native to Europe but now grows in damp fertile soils virtually throughout the world.  If you’re foraging for wild nettles, look in shady and moist locations like along creeks.

Stinging nettle is often considered a “weed” due to its promiscuous growth habits. It also catches a bad wrap as a bully (admittedly justified) by causing a painful itching and burning sensation to those who come in contact with the sharp hairs that cover its leaves. An inflammatory nettle rash is uncomfortable, but temporary and not dangerous. Furthermore, after reading about the stellar benefits of stinging nettle, perhaps you’ll realize that nettle can be even more of an asset than a nuisance!


A birds eye view of a swath of stinging nettles, they are green with jagged edged leaves.


Health benefits of stinging nettle

Herbalists, naturopaths, and many organic gardeners recognize stinging nettle as a favorable plant to have around – given its numerous and well-researched healing properties. Compounds found in nettle make it excellent at fighting bacterial infections, reducing inflammation and arthritis, relieving pain, easing allergy symptoms, stabilizing blood sugar levels, and more. In fact, this natural nettle quercetin is the only “allergy pill” I take – and I am quite sensitive to environmental allergens!


How to prepare fresh stinging nettles

In order to reap the benefits of stinging nettle, they need to be “de-stung” first. (That is, if you want to consume them yourself). The best and easiest way to prepare fresh stinging nettle is to blanch them in water. The brief exposure to high heat neutralizes the stinging hairs. Rinse them afterwards, which doubles as washing them as well.

Now, you can enjoy the blanched and rinsed nettles fresh, juiced, added to soup, frozen, or dehydrated into tea or powder for later use. Nettles are delicious and earthy, like a cross between spinach and arugula. I suggest sautéing them in EVOO with salt, pepper, and even a little garlic or onion – much like you would kale or other leafy greens.


Okay, that is all fine and dandy… but isn’t this article about stinging nettle fertilizer? How does nettle benefit other plants?


Why Make Stinging Nettle Fertilizer Tea


As a vegetarian and avid organic gardener, I find it extremely rewarding to be able to create our own free and natural plant-based fertilizers. Plants feeding plants, if you will. For example, by making various botanical teas or fermented plant juice – which is what we are doing today. The process is even better when the plant ingredients come from our garden, or can be foraged for locally! We also like to routinely feed our seedlings, newly-planted trees and other plants with homemade aloe vera soil drench. Of course, composting at home is the ultimate way to create free organic fertilizer.


The stinging nettle growing in the chicken run is shown, there are two chickens on the far side of the nettle with their coop in the background.
Every spring, a ton of stinging nettle pops up in and around our chicken run! Thankfully, the girls mostly free range elsewhere but don’t seem bothered by it until we get a chance to harvest.


The benefits of stinging nettle fertilizer for plants


Stinging nettle belongs to a special group of plants referred to as “dynamic accumulators”, which also includes yarrow, borage, fava beans, comfrey, dandelion, miner’s lettuce, and chickweed. Those “dynamic accumulators” readily take up nutrients and minerals from the soil, and then store them in highly bioavailable forms and concentrations in their leaves. This makes nettles (and all other dynamic accumulators!) an excellent nutrient-rich addition to botanical teas, homemade fertilizers, mulch, or to a compost pile.

Scientific studies show that fresh stinging nettles leaves are loaded with high concentrations of vitamins A, C, D, E, F, K, P, and vitamin B-complexes, as well as large amounts of minerals including calcium, selenium, zinc, iron, magnesium and more. As a leafy green, stinging nettle is also high in nitrogen, chlorophyll, and plant polyphenols – all of which bolster plant health and stimulate growth. Plant polyphenols in particular are potent antioxidants, fight cancer, and boost the immune system. 

While plants may not get arthritis or cancer in the same way humans do, plants do have an immune system – and can get sick! Therefore, the same compounds that make nettle awesome for human health provide many of the same benefits to plants. For example, plants treated with stinging nettle fertilizer are less susceptible to certain diseases due to nettles’ anti-bacterial and anti-fungal properties. Plants with a strong immune system are also less negatively impacted by pests or stress, such as drought, heat, or other unfavorable conditions.


A glass measuring beaker full of dilute stinging nettle fertilizer tea. It has been diluted to one part fertilizer to ten parts water for feeding plants through a soil drench. The tea is a light green color once it has been diluted. There are green and red cabbages growing in a raised bed in the background.



SUPPLIES NEEDED TO MAKE NETTLE FERTILIZER TEA


  • Stinging Nettle
  • Prick-proof gloves. Thick leather pruning gloves (or similar leather alternative) are especially protective against thorns and nettles.
  • Trimming shears or scissors 
  • Water, preferably un-chlorinated – such as collected rain water. To dechlorinate city tap water, either allow it to sit out in the sun in a bucket for 24 hours to allow the chlorine to dissipate, or use a carbon hose filter. 
  • Bucket with lid
  • Stir stick




INSTRUCTIONS 


I will go ahead and air the dirty laundry now: fermented stinging nettle tea fertilizer stinks. Big time! So much so, that it’s sometimes referred to as “nettle manure”. Or as I like to call it: Stinking Nettle Tea. Therefore, I strongly suggest you make your stinging nettle fertilizer outside somewhere and not in your garage or house. Please don’t let the funky aroma dissuade you from making nettle tea! But don’t say I didn’t warn you.


Steps to Make Stinging Nettle Fertilizer Tea


  1. Collect nettle in a bucket. We typically loosely fill a 5-gallon bucket. To harvest stinging nettle, you can either pull it out by the roots (if you don’t want it to grow back this season) or use scissors/shears to trim it instead. Wear gloves to protect yourself!

  2. In the bucket, chop the nettle into smaller pieces. Finer pieces equals more surface area for fermentation and the release of nutrients. 

  3. Add enough water to cover the nettle in the bucket. It should be able to stir freely and not be overly thick. 

  4. Set the lid on top of the bucket, but don’t seal it. 

  5. Stir the brewing nettle tea once per day if possible. Bubbles should appear as you stir it.

  6. After one to two weeks, the nettle tea is finished brewing. A good signal that your fertilizer is ready is when it stops visibly bubbling after stirring. That means the nettle is no longer actively fermenting.

  7. Strain the nettle solids from the tea liquid. We do this by pouring the solution through a funnel lined with a reusable paint strainer (which we use to brew actively aerated compost tea) into another bucket. Compost the leftover strained solids.

  8. Store the finished concentrated stinging nettle tea in a bucket with a lid. Nettle tea fertilizer must be diluted before it is applied to the garden! Read instructions below.

  9. Use brewed nettle tea fertilizer within about 6 months.


A four part image collage showing how to prepare stinging nettle when one is going to make stinging nettle fertilizer. The first image shows two gloved hands as they cut sections of growing stinging nettle out with hand trimmers. The second image shows the stinging nettle inside of a bucket and a hedger is chopping the nettle up into smaller pieces to increase its surface area. The third image shows a bucket of water being poured over the top of the bucket of harvested stinging nettle. The fourth image shows a bucket full of harvested stinging nettle and water with a stir stick being used to mix it around.
Harvest, chop, steep, stir.
A four part image collage on how one strains stinging nettle fertilizer once it has finished fermenting. The first image shows a closeup of the bucket of stinging nettle after a couple days of fermenting. There are still a lot of bubbles and activity within the bucket. The second image shows the bucket of stinging nettle after the fermentation process has stopped, there are no bubbles and the activity has ceased. The third image shows a bucket of stinging nettle fertilizer next to an empty bucket, a hand is holding a paint strainer and a funnel. The fourth image shows the empty bucket with a lid that contains a hole in the top. The funnel is lined with the paint strainer and they are both sitting inside of the hole on the top of the lid, sitting over the empty bucket while the bucket of stinging nettle fertilizer is being poured through the strainer and funnel into the empty bucket.
Still bubbling? Keep brewing. Once it stops bubbling, it is time to strain (about 1-2 weeks after creating the tea).


How to Use Stinging Nettle Tea as Fertilizer 


Nettle tea is very potent, and therefore needs to be watered down before using it to feed other plants in your garden. To dilute it into a usable fertilizer, mix 1 part brewed nettle tea to 10 parts water. For example, one quart of nettle tea to 10 quarts of water. We find it easiest to dilute and mix a small portion of nettle fertilizer in a separate container as-needed (immediately before use), rather than diluting a huge batch and storing it all. 


Nettle tea soil drench

After diluting, simply water your plants of choice with it as a “soil drench”, much like you would with other liquid fertilizers. The recommended dose depends on the size of the plant or container. A smaller plant or pot will be happy with just a cup or two. To feed larger plants or an entire raised garden bed with nettle tea, try applying it with a watering can evenly across the soil. When in doubt, start with smaller feedings, see how the plants respond, and go from there.

Feel free to repeat nettle fertilizer tea applications once every month or two, but not more often than every 3 weeks. Because of the odor, I personally avoid using nettle tea to feed houseplants – though it can be done! I stick to using compost tea or dilute seaweed extract indoors.


A hand is holding a beaker of dilute stinging nettle fertilizer tea and watering two auto flowering cannabis plants that are growing in a 10 gallon fabric pot.


How to use stinging nettle tea foliar spray

In addition to feeding the soil and roots, you can also spray diluted nettle tea onto a plant’s leaves. When applied as a foliar spray, stinging nettle tea works as a strong insect repellent. The active compounds in stinging nettles are reported to deter aphids, mites, and thrips. Even more, plants readily absorb nutrients through the leaves, entering their vascular systems even more quickly than those taken up by their roots.

To make nettle foliar spray, be sure that your brewed nettle tea has been strained very well with a fine mesh strainer. Otherwise, leftover plant material will easily clog your sprayer. This time, dilute 1 part nettle tea to 20 parts water and add it to your sprayer of choice. It is best practice to apply any type of foliar sprays in the evening hours once the plant is out of direct sun. This reduces the risk of sunburn to wet leaves, and is the time when beneficial insects are least active. Spray the leaves until they’re thoroughly coated and dripping.

Due to the funky odor, we generally avoid spraying leafy greens like kale or lettuce with nettle tea. Or, directly on to fruit and veggies. However, nettle tea foliar spray is excellent for things like hemp (before flowering), ornamental plants, or tomatoes, peppers, eggplant or fruit trees – before their fruit appears.


Aaron is crouched down in the chicken run after harvesting a bucketful of stinging nettle. The plants have been reduced in size and numbers after the harvest though many should still continue to grow.
He cleaned up the run pretty well! He also chose to leave the roots in place, so the nettles will sprout again for another harvest this season. In case you’re wondering, those are our rainwater tanks on the right – perfect for making nettle tea and other compost brews! You can read more about rainwater collection basics here.


So simple, right?


In summary, plants that receive stinging nettle fertilizer tea will experience increased growth and resilience! Making your own nettle tea with homegrown or wild nettles is free, sustainable, and easy to do. I hope you enjoyed this article, and feel excited to go hunt down some nettles of your own! Please feel free to ask questions in the comments below, and spread the nettle love by sharing this article.



DeannaCat signature, keep on growing

39 Comments

  • Lucas J Salvetti

    Hello,
    Thank you for making this!! I have question, do I have to use stinging nettles or can I use the white vervain type of nettle to make fertilizer er for cannabis plants?

    • Aaron (Mr. DeannaCat)

      Hi Lucas, essentially you can make this tea with any plant, some people even prefer any of the faster growing “weeds”. Depending on their availability in your area, comfrey, borage, and yarrow would be good options as well. Hope that helps and good luck!

    • Aaron (Mr. DeannaCat)

      Although we have never used it, I would think that it would work just fine. It looks like it is in the dandelion family and is considered a “weed”, many people that use different FPJ’s (fermented plant juice) prefer fast growing weeds for fermented fertilizer. I would look into borage and comfrey as well if you have any growing around your area. Good luck!

      • Laura Brickell

        I want to use the copious amount of nettles & comfrey I have on site but they are in full flower & seeds are forming. To date I have painstakingly chopped off the seed/flower heads of the comfrey before making tea but tbe nettles defeat me. Do I need to worry about it? Will the fermentation kill off the seeds or not? More worried about the nettle seeds.

        Also I read not to feed roots veg & beans with nettle tea. Why not? Surely during the leaf growing stage it’s ok.

        • Aaron (Mr. DeannaCat)

          Hi Laura, we have used nettle with seeds and after it is done fermenting, we strain the liquid through a paint strainer to get out all that remains of the leaf material and the seeds as well. It seemed to work as we didn’t have nettle sprouting up everywhere. You can probably still use the tea on those crops but they typically don’t need as much nitrogen to grow. Are you going to make two separate teas? As the comfrey would be great for fruiting plants and the nettle would be good for leafy green growth and plants before they start to flower. Hope that helps and good luck!

  • Khin Thandar Sint

    Hi Deanna,

    I went to forage some stinging nettle in my area and I accidentally snapped a flowering one and brought it home and put it in my tea. Now I’m freaking out that it will spread in my garden through the seeds from the flower… Am I over thinking? I have two little boys that likes to spend time with me in the garden and I wouldn’t want any stinging nettles spreading in my garden. Thanks!

    • Aaron (Mr. DeannaCat)

      Hi Khin, use a paint strainer or milk nut bag to strain the solids from the liquid once it is done fermenting. This will likely trap and separate any of the seeds from your nettle fertilizer. Hope that helps and good luck!

    • Aaron (Mr. DeannaCat)

      Hi Karli, I mostly use nettle tea for flowering plants such as tomatoes, peppers, eggplant, squash, cucumbers etc. Thanks for reading and good luck!

    • Aaron (Mr. DeannaCat)

      Hi Richard, that should be perfectly fine as long as your foliar and soil drench are diluted to the appropriate strengths. Good luck!

    • Nadsa

      Love your website that I stumbled upon looking for nettle tea fertilizer to use as foliar spray. How often do you recommend spraying the leaves? Thank you for the wealth of info you offer!
      Nadsa

      • Aaron (Mr. DeannaCat)

        Hi Nadsa, we are glad that you enjoy the website and we appreciate you reading the content! It really depends on what type of plants you are intending to spray but I wouldn’t spray more than once a month and if you are intending to spray flowering plants, do so until they start producing fruit. Hope that helps and good luck!

        • Aaron (Mr. DeannaCat)

          Hello Renee, I don’t see why you couldn’t as many plants can be used to “feed” plants. Dandelion, yarrow, borage, and comfrey could be used in the same way as well. Let us know how it works out for you and good luck!

    • Aaron (Mr. DeannaCat)

      Hello Brian, give it a go as we make teas with alfalfa, kelp and or neem seed meal though it likely won’t be too fermented. Either make the tea the same way as we describe in the article (only you would be using dried nettle) or pulverize the nettle into a fine material and use 1/4 to 1 cup per 5 gallons of water and let sit for 48 hours or place the nettle in a fine mesh bag and aerate with a bubble snake for 24 hours and water or spray plants from there. Let us know how it works out for you.

    • S.T.

      Hi. Did you try the dried nettles? How well did it work? (I don’t have fresh stinging nettle in my area and am a bit afraid to grow it for this purpose due to the dog.)

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