Why You Can Pee on Your Tomatoes (and your dogs can’t)

by on August 14, 2012


Since I first wrote about the discovery that human urine was good for tomato plants, rarely a week goes by that I don’t get some sort of feedback on the issue. From amazement to disgust, everyone has an opinion and most seem to want to share it. Most recently, I have been asked for the details of how and when I disseminate my special recycled water to the tomatoes, so I wanted to give a little more information on the topic for our UrbanFig readers.

First, you need to know that human urine is rich in Nitrogen, Phosphorus, and Potassium. In studies that were published in 2009, tomato plants that as much as quadrupled in production. According to the study as well, these tomatoes were higher in protein and were completely safe for human consumption. When compared to the cost of mineral-rich fertilizers that produce a similar result, you can beat the cost of pee!

In my own experience, I have diluted urine with rainwater at a rate of about 1:10 and watered my plants normally. Though hardly a scientific study, I have noticed over the years that tomatoes consistently watered with urine do tend to produce higher yields overall.

We want to hear from you! Would you consider trying urine as a watering supplement for your tomato plants? Why or why not?

{ 5 comments… read them below or add one }

Paul McCullough August 15, 2012 at 10:45 AM

I’ve been pouring pee into my palm trees for a long time time! even though it is the end of my tomato plant season. I’ll reserve some pee for them too!


Sarah August 15, 2012 at 3:53 PM

It is great for compost starting. I’d like to know if the drugs I take will end up in the veggies, though; am I making homeopathic groceries? Really, everyone in New Orleans drinks Mississippi River water which has ALL the drugs from ALL the towns upstream in it. If Homeopathy worked, everyone in New Orleans should be superheros by now (they are not).


Carol August 16, 2012 at 10:37 PM

Do you live in New Orleans?


Sarah March 28, 2013 at 5:08 PM

I did, but not now.


carolyn June 16, 2013 at 10:34 AM

where’s the part about dogs?


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