Tuesday, February 12, 2013

Permaculture Plants: Stinging Nettle


The Stinging Nettle - a beautiful plant with an attitude!
This photo is from my yard

Common Name: Stinging Nettle
Scientific Name: Urtica dioica
Family: Urticaceae (the Nettle family)

Perfect young shoot for harvesting

Description:
A harbinger of Spring, the Stinging Nettle has long been used as a food and medicinal plant. Yes, they do sting, but it is not that bad. I accidentally discovered them in my garden about a week ago when planting some garlic bulbs (see my prior article about using sprouted garlic). I was pushing some new growth back to clear a small patch of soil when I felt a sharp pain on the back of my hand. It felt like a fire ant sting, which I have had plenty of experience with growing up in south Florida. But there was no insect on my hand. I looked around and found a tiny Stinging Nettle plant a few inches tall. This meant two things... First, I needed to get some gloves. Second, it was foraging time!

I did a quick search around my neighborhood and discovered a large patch in my neighbor's yard. I harvested a large bag full and took them home. My neighbor was happy to have me cut some of his "weeds" back. He was a bit skeptical about their being edible. I explained that the "sting" is neutralized within about 30 seconds when exposed to heat. I also showed him how you can even eat them raw, if done the right way, but he wasn't about to try it. I took my new picked treasure home and made some Stinging Nettle and Pork Belly soup with a homemade duck stock... delicious! That same neighbor came over and tentatively tasted the soup, then proceeded to devour it, raving about how good it was. Another convert!

Another photo from my yard - you can just barely see the hairs on the leaf

Now, most people would not plant these on purpose, but they often will pop up in yards, typically in rich, moist soils. If you have a larger property, you can "cultivate" them in an out of the way corner. If you have some real land, then you likely already have them growing somewhere. It is just a matter of locating them. This is when I would consider Nature Tending.

Stinging Nettle can be eaten, used for tea, used medicinally, and used to make a fiber similar to linen. They are also attractors of beneficial insects. The plants accumulate large amounts of nutrients, and if composted can be a valuable fertilizer to your garden. These are resilient and useful plants that have a poor disposition, but are worth the trouble in my opinion.

Urtica dioica

History:
Native to the Northern Hemisphere, Stinging Nettle has long been used for medicine and food. It has been introduced around the world, and is now seen more as a weed than a beneficial plant.

A real close up view of the stinging hairs (large) and non-stinging hairs (small)

Trivia:

  • The sting from Stinging Nettles comes from their stinging hairs, called trichomes. Stinging Nettles are covered with hairs, but not many are actually the stinging hairs. These stinging hairs are on the underside of the leaves and on the stems. When touched, the tip of the hair is displaced, and what is left resembles a hypodermic needle. This needle will inject chemicals that cause itching, irritation, and pain.
  • Stinging Nettles inject histamine, acetylcholine, serotonin, morodin, leukotrienes, and formic acid (formic acid give fire ants their "fire").
  • Stinging Nettle leaves can be eaten raw... just hold the leaf only on the top side, fold it over on itself to cover the stinging hairs on the underside of the leaf, roll it up, squeeze it a bit to make sure the stinging hairs are all crushed, then take a bite. Yes, I have done this. No, I did not get stung. Yes, it tastes good!
  • Exposing Stinging Nettle to heat for about 30 seconds (like boiling water for tea or soup) neutralizes the sting, as does drying the leaves
  • There are many species in the genus Urtica that are likely all edible, but check with local experts before you start foraging for other species.


Stinging Nettle Soup is delicious!
Here is a link to one recipe... I'll share mine soon.

Stinging Nettle leaves dry very well... and the sting is gone!


USING THIS PLANT
Primary Uses:

  • Edible Leaves - used fresh and cooked briefly; leaves dry well and can be stored for later use
  • Tea Plant - fresh or dried leaves are used


Secondary Uses:

  • Dynamic Accumulator (Potassium, Calcium, Sulfur, Copper, Iron, and Sodium) - excellent addition to compost
  • Manure Tea Plant - high in Nitrogen
  • Lacewings prefer to lay eggs on Stinging Nettle leaves
  • Ladybugs prefer Stinging Nettle foliage
  • Fiber Plant - obtained from the stems. Makes a strong fiber similar to flax which can be used to make cloth similar to linen. The fiber can also be used to make paper
  • The seeds can be pressed to produce an oil that can be used in lamps
  • Dye (green) from the leaves and stems
  • Extensive medicinal use
  • Juice from the leaves have been used for hundreds of years to curdle milk for cheese making if rennet is not available
  • Drinks can be made from the young shoots - non-alcoholic drinks similar to ginger-beer and alcoholic drinks like beer and wine


Harvesting: Spring. Leaves are best when the plant is less than 3 feet tall, before flowering has occurred. Ideal is when they are under a foot tall. Use gloves to avoid the stinging hairs on the underside of the leaves and stems.
Storage: Can be dried and used as needed. Many people will just keep the fresh leaves in a brown paper bag, shaking occasionally, until dried.

An out of the way corner of a larger property is great for Stinging Nettle

DESIGNING WITH THIS PLANT
USDA Hardiness Zone: 4-8
AHS Heat Zone: No reliable information available.
Chill Requirement: No reliable information available.

Plant Type: Herbaceous Perennial
Leaf Type: Deciduous, but can be "evergreen" in areas with mild winters
Forest Garden Use: Herbaceous Layer, Ground Cover Layer
Cultivars/Varieties: Many subspecies and varieties, but no significant development

Pollination: Plants are dioecious, meaning they have either male or female flowers (hence the scientific name: dioica). Both male and female plants (typically a 1:8 ratio) are needed to produce seeds.
Flowering: Summer

Life Span:
No reliable information available, but not really needed. These plants spread so easily with runners and seed, that as soon as one plant dies, another will take its place.

The spreading nature of the Stinging Nettle makes it a pretty good ground cover...
...but also tricky to eradicate.

PHYSICAL CHARACTERISTICS OF THIS PLANT
Size: 1-6.5 feet (30-200 centimeters) tall, usually about 3 feet (100 cm) tall, and indefinitely wide
Roots: Fibrous roots which have stolons (aka "runners" - stems right at ground level that form roots) and rhizomes (roots that spread along ground level), both of which can form new plants
Growth Rate: Fast

The flowers of the Stinging Nettle are tiny, but develop many seeds.

GROWING CONDITIONS FOR THIS PLANT
Light: Full sun to partial shade
Shade: Tolerates medium shade
Moisture: Medium, but can tolerate fairly wet soils
pH: tolerates a fairly wide range of soils (5.5 - 7.5)

Special Considerations for Growing:
Tolerates juglone (natural growth inhibitor produced by Black Walnut and its relatives). Consider using this tree as a buffer between your walnuts and other plantings.

Propagation: Few people propagate this plant on purpose, but transplanting young plants from stolons or rhizomes is easy. Seeds easily - just rub the mature seed heads, releasing the seeds, over where you want the Stinging Nettle to grow.

Maintenance:
None required.
To control growth and spread try these methods, and always protect your hands and arms:

  • Cut off the flowering heads to reduce seed production - typically done in late Summer when the plants are tall. A scythe is a great tool for this job.
  • At least once a season, and maybe a few times, pull up any plant that is growing outside of where you want the Stinging Nettles to grow. 


Concerns:

  • Stinging Nettle can spread fast through runners and easily through seed.
  • Stinging Nettle can... well, sting! Some people have a very small reaction, and others will have a more significant local reaction.
  • Consuming too much nettle and especially from older leaves can cause a laxative effect - which is one of the medicinal uses
  • Older leaves contain cystoliths which can irritate the kidneys - another reason to use just the tender, young leaves which taste better anyway!



45 comments:

  1. John, I have read about Stinging Nettle for awhile, but now I will have to look for it. I think that is the weed that has been growing in my front yard.

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  2. If you do happen to get "stung" by the nettles, find some milkweed and put some of the milky sap on. It immediately takes the sting away.

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  3. I am happy to learn that stinging nettle is juglone tolerant.

    I love stinging nettle and have space for it in a rather shady place with rich soil under a black walnut.

    I have searched quite a bit to learn whether or not it is juglone tolerant. I think folks leave it off lists of juglone tolerant plants because it does not cross their mind that a person would want to grow stinging nettle under a walnut tree.

    Blessings with your growing.

    The great Tibetan Yogi Milarepa lived on nettles.

    ReplyDelete
  4. Am I imagining this..but is there a correlation between apple trees and nettles and specifically the sting is more painful due to the soil composition that rotted wind falls contribute to the soils "composition"?

    ReplyDelete
  5. That is a very interesting observation. There may be something to it. While I have not seen that myself, there are a large number of factors that make a plant express different characteristics... this is the "terrior" the French use to describe all aspects of land, soil, climate, pH, wind, etc. that make grape vines produce superior or inferior grapes. In reality, the local terrior influences all plants. I cannot see why nettle would be any different. I would be curious if this was true in other locations as well.

    Thanks for the observation!
    John

    ReplyDelete
  6. I love nettles!! thanks for the info. I'm hoping to grow some indoors over winter. hopefully my fall plantings outside will work next spring as well?

    ReplyDelete
  7. Hi- I planted some this spring and enjoyed it in soup but now it is gone to seed. I live in Northern California outside of SF bay area. How do I prepare it for the winter to get it through to the spring? I am going to remove (and put by) some of the seeds mainly because I need it not to spread anymore, but should I cut it back and mulch like with other perennials? Will it come back in the spring due to underground rhizomes or do I need to do anything more? Thank you for your reply.

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  8. One other questions... I had put it in next to some comfry (knit bone) which now seems to have died as a result. Any thoughts?

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  36. Love Stinging Nettle, trying to grow it here in Houston TX area , but i think its too hot for them. I grew up eating stinging nettle soup, and our grandma also punished us by hitting us with it instead of spanking. We were mad when we were kids, but if you read more about them, the sting is actually good for the skin and for arthritis as well. The soups we make are awesome! I miss it! Thanks for the articles, i love it when i find something like that written by Americans, because unfortunately, people that i meet, don't like to experiment on new/strange plants/fruits/vegetables.

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