En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?


Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
rate this answer
4 ratings

Friday - May 22, 2009

From: Syracuse, NY
Region: Northeast
Topic: Watering
Title: Will chlorinated pool water affect the soil in a vegetable garden?
Answered by: Barbara Medford


For the first time I'm going to plant a vegetable garden, and I have an area cleared. My swimming pool cover came off over the winter, and the pool water is a dark green to look at, but looks clear when I started pumping it out. As it started pumping out, I thought the green might be nutrients and started watering the patch of land cleared for my garden. After several minutes I realized that the water had been clorinated 8 months ago, so I moved the drain hose just to the back of my yard. Do you think I have damaged the quality of the soil? Have I poisoned the soil and should I not use that space now for vegetables??? Thank you for your anticipated answer and for being willing to help others.


Please don't let this get around, but Mr. Smarty Plants doesn't know everything. In the first place, we rarely deal with vegetable garden questions, because most vegetables are either non-native to North America or so hybridized they have little resemblance to the original plant. However, we are always interested in practices that may impact the environment. We are gardeners, not chemists, and found it necessary to do a little research on the subject. On some of the sites, we only understood words like "a", "and" and "the." But we found some that used shorter words and more terms we understood. From the first one, Wisconsin Department of Health Services Chlorine; we learned that chlorine is included in most public water systems to combat bacterial action. This is the water you drink and the water you put on your garden.

To get more specific about how the chlorine reacts in the pool, we went to this howstuff works website poolcenter.com Chlorine Chemistry. A passage from that article:

"Pool water is very similar in makeup to the city water right out of the tap. Many people water their lawns with higher chlorine and lower pH than is found in their pool."

We could find no indication that the chlorine content in the pool water would be dangerous to the soil or to the plants that might grow in that soil or the people who might eat those plants. Our conclusion is that it would probably be better not to drain your pool into your vegetable garden, but that you have not destroyed its usefulness as of now.  And keep in mind also that wherever you drain that pool water, it continues to be part of the environment.




More Watering Questions

Leaf browning on blackfoot daisy in Arizona
August 26, 2008 - Blackfoot daisy plant was doing great; then, in one day, it turned brown like it had no water. Have a watering system in place which waters once a day for one hour 1/2 gallon a hour.
view the full question and answer

Desert willows not doing well in Navarro County, TX
May 16, 2009 - Planted 3 new desert willows , 3-4 ft.in February. Live in East Navarro County and soil is clay with slight slope to Richland Chambers lake area. Had a wet spring. These plantings appear not doing we...
view the full question and answer

Redbud leaves turning yellow in mid-summer
July 13, 2012 - The leaves on our redbud trees are turning yellow. The yellow leaves are pale with no other spots and no dark veins. I don't know for sure which variety of redbud they are or how old they are (more t...
view the full question and answer

Difficulty of watering at drip line of trees from The Woodlands TX
August 18, 2011 - I'm watering my couple dozen native mature trees to make sure they survive this drought and its aftermath..and I'm reading about how to water at the drip line. But..all of my trees' drip lines ext...
view the full question and answer

Sad Germanders in Johnson City Texas
September 16, 2011 - I have some grey bush germanders that never seem to do well although they did at first when I planted them four years ago. They have sun and dappled shade on the south side of the house. A friend in ...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2015 Lady Bird Johnson Wildflower Center