Does Human Urine Kill Grass? (Ways to Fix +Benefits)

Every lawn keeper desires healthy lawns with green, dense, well-cut lush grass. The sight of yellowing grass and brown patches immediately signifies underlying problems. Lawn disease, underwatering, or harsh weather conditions can turn grass brown and form lawn patches. But can human urine kill grass? 

Human urine can kill the grass when done repeatedly in the same spot due to the high nitrogen content that bombards the soil. Urine damage symptoms include; yellowing, drying, and turning it into brown dead grass spots. A small amount of human urine on grass fertilizes the grass, accelerates decomposition, and treats fungal infections, among other benefits.

What happens when you pee on grass?

Pee on grass has different effects. Humans produce a small amount of pee. However, this small amount of pee can kill grass if you repeatedly pee in a small section. The grass turns yellow and may eventually die.

What happens when you pee on grass?

The frequency of peeing is a significant factor in the extent of damage human pee causes to the grass. Peeing on the grass once may not have visible effects on the grass. However, if the person pees a couple of times on the same spot, the grass will turn yellow, dry up, and die if no control measure is implemented.

The uric acid concentration in human urine also affects the extent of grass damage. If a dehydrated person pees on the grass, the grass is likely to turn yellow because of the high nitrogen deposited in the soil. Yet when a hydrated person pees on the grass, there will be significantly less damage because of low nitrogen content. 

Is human urine good for grass?

Human urine is beneficial for grass but harmful in concentrated amounts. Although it would take a comically large amount of human urine to benefit grass.

Here’s how pee is beneficial to the grass:

Fertilizes the grass

Human urine contains high levels of nitrogen in the form of urea and dissolved ions such as phosphorus and potassium. Theoretically, human urine would make eco-friendly fertilizer. Applying diluted human urine ensures adequate nitrogen is supplied to the soil to grow grass greener, healthier, and faster.

Dilute the pee in a ratio of 20:1 (twenty parts water to 1 part urine) before applying it to the soil.

Use dilute urine once in 10-14 days to prevent applying excess nitrogen to the soil, which causes yellowing and burning of the grass.

See Also: How to Get Burnt Grass Green Again.

Treats fungal diseases

Human urine contains uric acid, which has several uses in the garden. First, uric acid treats moderate levels of fungal diseases like leaf rot, mildew, and mold. To kill fungal infections from your grass using urine, dilute it with 20 parts of water and put it into a spray bottle. 

Treating fungal diseases is best done in the morning when dew is present. Dew dilutes the urine and prevents it from sticking to the leaves and blades of the grass. Spray the diluted urine on the mold, mildew, and grass parts affected by the fungal infection.

Enhances  the soil

Urine contains phosphorus and potassium. These elements can help improve depleted lawn soil. Suppose you want to replenish the drained soil; peeing on it in autumn will boost its potassium and phosphorus content. By spring, the ground would be nutrient-rich to support healthy grass growth.

Human urine helps kill weeds from the lawn

You can use concentrated human urine to kill and remove weeds from the lawn. Collect the first urine in the morning (usually more concentrated and sterile) in a container, and don’t dilute it. Put it into a spray bottle, then spot spray on the weeds you want to kill. Multiple human urine applications turn the weeds yellow, burn them, and kill them eventually.

You can also add the urine to compost to make a fertilizer that feeds the grass and prevents weeds from growing on the lawn. 

Human urine keeps small animals away from the grass

If your lawn is prone to small animals like foxes, rabbits, and cats’ invasion, keep them away by spraying urine on the grass. While the smell may be unnoticeable to humans, undiluted urine smells more potent to animals. They’ll avoid the pungent smell. 

Accelerates dead matter breakdown

Uric acid in the urine fastens the decomposition of dead matter in the soil when applied in small diluted amounts. More rapid breakdown helps release nutrients to the ground, which the grass takes to grow greener and healthy.

Can human urine kill grass?

Human urine can kill grass when you often pee on the same spot. Concentrated urine contains high nitrogen content and other organic compounds. While nitrogen helps grow grass greener and healthy, excess nitrogen causes yellowing, burns the grass, and kills the grass.

Excess nitrogen in the soil and the nitrogen in undiluted human urine forces the grass to lose water. Therefore, the grass turns yellow and dries out. Without intervention, the grass will die.

How to fix and prevent human pee from killing grass

Often peeing on grass makes the affected area yellowish. The grass can die if the area is not treated.

Can human urine kill grass? How to fix and prevent human pee from killing grass

Follow these steps to fix and prevent human urine from killing your grass.

1. Replant grass in the area

Areas highly affected by human urine have brown spots from dead grass. Dead grass is challenging to revive. The best solution is replanting grass in the area. Dig grass from the spotted sections using a trowel to remove them. And because the soil in the brown spots also has salt build-up, dig them out and remove them. Spread fresh soil. 

Plant new grass seeds on the site. Fescues and ryegrass grass seeds are suitable because they are less affected by human pee. Water the area to encourage seed germination and let the grass grow as desired.

2. Water the site

Rinse lawn areas using a sprinkler or garden hose to wash off salts and harmful compounds around the soil and the grass. Maintain a regular watering schedule until you see greener grass and new growth around the affected area.

3. Fertilize the area

Fertilizers have nutrients that feed the grass to encourage healthy growth. They are suitable and recommended for less affected lawn areas. Apply fertilizer to green the grass and make it healthy again.

4. Apply lawn repair treatments

Lawn repair treatments contain organic enzymes and cleaners that feed the grass and flash out the soil’s excess salts and inorganic compounds. The treatments are available in online stores, garden stores, or supermarkets.

The enzymes and nutrients from the lawn repair treatment encourage the healing of grassroots and new grass growth in the urine-affected area. Spray the lawn repair treatment on the site and wait for healing and new growth.

5. Apply dilute baking soda

Baking soda is alkaline and can be used to neutralize acidity from human pee. If you accidentally peed on the lawn, apply diluted soda to the area to prevent the urine from harming the grass.

Mix two tablespoons of soda with 1 gallon of water and transfer the solution to a spray bottle. Spritz the mixture thoroughly over the area to neutralize the urine acidity.

Note: Excess baking soda can kill the grass lawn.

Can you spray human urine on your lawn?

You can spray diluted human urine on your lawn as a natural fertilizer. Human urine contains nitrogen and salts like phosphorus and potassium. 

Can human urine be used as a pesticide?

Human urine has insecticidal properties that keep pathogens, fungi, and parasites away. It can be used as a pesticide to treat pest-related diseases and keep them away from plants. Urine is safe to use around plants and soil. To treat them, spray diluted urine on the plants affected by the pests.


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