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Is human urine good for plants?

Author

Emily Sparks

Published Jan 23, 2026

Human urine is one of the fastest-acting, most excellent sources of nitrogen, phosphorous, potassium and trace elements for plants, delivered in a form that's perfect for assimilation.

What plants benefit from human urine?

"It is totally possible to use human urine as a fertilizer instead of industrial fertilizer," says Heinonen-Tanski, whose research group has also used urine to cultivate cucumbers, cabbage and tomatoes.

How do you use human urine for plants?

Dilute one part fresh urine to 10-15 parts water for application on plants in the growth stage. Dilute one part fresh urine to 30-50 parts water for use on pot plants, which are much more sensitive to fertilisers of any kind.

Does human urine help plants grow?

Recent scientific studies have shown urine is a safe and very effective fertilizer for cabbage, beets, cucumbers, and tomatoes, and pretty much anything else you want to grow. Urine boasts a nitrogen-phosphorus-potassium (N-P-K) ratio of 10:1:4, plus more modest amounts of the trace elements plants need to thrive.

Does human urine damage plants?

Excess urine in the soil can introduce toxic levels of nutrient into the soil and thus kill the plant as seen in the case of urine fertilizer; the large amount of nitrogen is the main concern. A rule of thumb is that the toxic level of nitrogen is approximately four times the normal fertilization rate.

19 related questions found

How often should you water a plant with urine?

On a hot day, the plants will wilt easily, and require frequent watering. With such a constant throughput of water, diluted urine can be applied as frequently as 3 times per week. For use on containers, urine can be diluted with water at the rates of 3:1 or 5:1 and applied once, twice or three times a week.

Is human urine good for roses?

Use of Human Urine

Human urine is rich in nitrogen and urea that contains high levels of potassium and phosphorous. Higher than any fertilizer you can buy from a local vendor. The ratio of water to urine should be 8:1. Collect a cup of urine and pour it into eight cups of water in a watering can for fertilizing roses.

How long can I store urine for fertilizer?

Store the urine for 6 months in a sealed container before using it, and wait another month before eating the food crops as an added precaution.

Should I pee on my compost pile?

Many gardening and composting sites recommend adding urine onto compost heap to help speed things up. With cold composting this provides the bacteria with a source of food which can be digested quickly producing heat rapidly.

Is human urine good for bougainvillea?

Tip: Make Bougainvilleas Bloom Year Round

Here are my tips, just save your urine in a pail any time of the day then just add some water to it and you can use this mixture to water your bougainvillea, morning and afternoon, you can do this thrice a week and expect that anytime soon, your plant will bloom.

Can human urine be used as pesticide?

Sterile human urine has insecticidal properties that help in keeping the soil free from pathogenic fungi and parasites. Unlike other commercially available pesticides, it doesn't linger in the soil for long nor imposes any health risks, both short or long-term, on plants. Also, undiluted pee can work as a weed killer.

How long does it take urine to decompose?

Overall, the biogeochemical degradation of a pulse of human urine extended for no more than 20–30 days after application, when at least 90% of the total N introduced by an amendment of urine was converted to NH3 and NH 4 +.

Is urine good for tomatoes?

pee. Apparently, human urine works remarkably well as a fertilizer for tomatoes, according to a new study out of Finland. Plants fertilized with a mixture of stored human urine and wood ash produced 4.2 times more fruit than plants without the pee, the study found.

Does urine make good fertilizer?

Fresh urine is high in nitrogen, moderate in phosphorus and low in potassium and can act as an excellent high-nitrogen liquid fertilizer or as a compost accelerator.

Is urine good for grass?

Urine contains a number of beneficial nutrients also found in commercial fertilizer, such as “nitrogen, a little bit of phosphorus and potassium, which are all needed for a healthy lawn,” Owen Duckworth, associate professor of biogeochemistry at North Carolina State University, told Popular Mechanics.

Is beer good for plants?

Beer is packed with beneficial bacteria yeast, potassium, calcium, magnesium, and phosphorus. These nutrients work well together helping gardens thrive. It makes a great not waste solution to gardening and can save you money on your garden by eliminating expensive fertilizers from your shopping list.

Can you put too much urine on a compost heap?

Empty when full. The only problem would be from adding too much urine at one time. If the pile smells like piss, add more leaves, or some dirt (soil), or finished compost, and mix well. Check out Joe Jenkins "The Humanure Handbook" and website for more information on composting human "waste".

How do I collect urine from my garden?

Fine charcoal powder goes with the urine into the small bucket. This – it turns out is a great combination for most plants in the garden because it adds potash. I then use it in the garden and on potted plants by putting a quart or two into a 3 gal. watering can of water to fertilize whatever needs it at the moment.

Is human urine good for fruit trees?

Fresh human urine is sterile and therefore free from bacteria. It's advised however to dilute the urine with water and use on plants that require added nitrogen such as corn and squash, tomatoes and cucumbers, during their fruit-bearing stage.

Is female urine good for plants?

Urine can be used as a fertiliser without fear it will fuel the spread of antibiotic resistance, researchers have revealed – although they urge caution against using fresh bodily waste to water crops. Urine is rich in nitrogen and phosphorus and has been used for generations to help plants grow.

Can urine be used as a foliar spray?

Urine can also be used as a foliar spray with a dilution of twenty parts water to one part urine.

How often should you fertilize with urine?

Many gardeners apply urine whenever they judge plants to be growing slowly or looking pale, applying about a gallon of urine per 100 square feet every couple weeks until the plants become more vigorous.

Do eggshells help roses grow?

Plant an Eggshell First

Before you transplant a new rose plant or bush, add some crumbled or powdered eggshells in the hole. This will give the new rose plant a boost of calcium and nutrients from day one. Eggshells also assist in aerating the soil and reduces the acidity in the soil.

Is human urine good for houseplants?

Yes, human urine is good for houseplants when diluted. It will provide your plants with nutrients that might otherwise be lacking in their soil.

How long does it take for urine to turn into ammonia?

Urine for a pleasant surprise

Fresh human urine is sterile and so free from bacteria. In fact it is so sterile that it can be drunk when fresh; it's only when it is older than 24 hours that the urea turns into ammonia, which is what causes the 'wee' smell.