First crop!
Graywater gardening serves us well during California’s droughts.
I’ve always felt guilty about letting the water run in the shower until it’s warm enough to suit me.
It seems like such a waste to watch the water spin down the drain.
For water-saving reasons when we lived in the country with an iffy septic tank, we bought a front-loading, water-saving energy-efficient washing machine more than 20 years ago.
It helped, particularly in years I did two loads of laundry a day.
With drought upon us yet again, we examined ways to make this new home more water-efficient and were delighted when Sonoma County made it easier to install a graywater system.
What is graywater? Click to Tweet
According to our county website:
The garden bed in the March rains.
“Graywater is untreated wastewater that has not been contaminated by any toilet discharge. Graywater includes wastewater from bathtubs, showers, bathroom sinks, clothes washing machines and laundry sinks.
It does not include wastewater from kitchen sinks, dishwashers, photo lab sinks, or laundry water from soiled diapers.”
I’d suggested storing gray water at our last house, but that required pumping water up a hill to the vegetable garden. That didn’t seem practical or cost-saving.
In our new house, though?
All we needed was a valve, a hole in the wall, and PVC pipe. It took a few hours and we were in business.
Ironically, we put the system into place in March–on one of the few rainy days we had!
How does a graywater system work?
We installed a new valve w on the washer drain–note you can release graywater into the yard or down the drain.
The outdoor pipe came out halfway down the wall. It went down the side of the house and then “T”ed into a perforated PVC pipe that ran the length of the bed.
We have a slight slope in our yard, so a shorter perforated pipe (the area is about four feet by 20 feet) was “elbowed” into the end and extended across the top of the bed about where the sidewalk bends. (See above photo).
The washing machine’s discharge motor pumps strong enough for the graywater to reach the end of the shorter arm, and run the length of the house.
My husband figured the draw of gravity would enable that shorter arm to water whatever we put in down there.
It worked.
What about the garden bed?
We dug the bed into the adobe clay soil a foot or so deep. The first thing our trusty assistant Daniel did was siphon off the excess water!
Once the ground was less muddy, Daniel set the perforated pipe on the ground and then covered it with a thick–at least three inches–layer of mulch.
The instructions indicated vegetables should not touch the soil–thus we planted them on a trellis.
We planted green beans, cucumbers, pumpkins, tomatoes (in cages), and what we thought would be a climbing zucchini–at least that’s what we think it is.
It didn’t climb, and we decided to eat it anyway with all that mulch between the plant and graywater.
Trellis. You can see the dryer vent to the left; pipe from washer is directly behind the left trellis.
Just past the dry vent, you can see the discharge pipe coming through the wall; painted to match the siding.
Seedlings, not seeds
We used seedlings which enabled us to dig a hole in the mulch, touching the clay “topsoil,” putting in “real” topsoil, and placing the seedling in the hole. We pressed down the soil around the seedling (planted near the bottom of the trellis), and then surrounded it with mulch.
Tomatoes can be planted deep and they got their own cages.
The cucumbers and beans climbed fast
The peas came in first, but the green beans and cucumbers were right behind them. This spot is sunny; we’ve been eating tomatoes since May– two months after we planted them.
Beans climbing their teepee–one month in the ground!
We have to use a special soap available at both Safeway and Costco.
With a valve on the washing machine rinse water discharging line, I can release the graywater into the garden (which we do most of the time), or, when I need to use bleach or a harsher chemical, I can turn the valve and release the rinse water into the sewer system.
This will be particularly important in the winter when, God-willing, we’ll have rain again.
You can buy the right soap at most stores.
I don’t think all my plants get the same amount of water. So once or twice a week I rinse off the leaves (as if it were raining), and provide more moisture for the ones farther from the pipe buried under the mulch.
“I think this is the best garden you’ve ever had,” my husband said the other day.
He may be right.
All I do is wash clothes, and vegetables grow effortlessly! Click to Tweet
Beans anyone?
The beans in August.
We haven’t discerned any difference in taste.
You can even grow small sugar pumpkins on a trellis! We have not discerned any difference in flavor from vegetables grown this way.
The cucumbers are prolific and we’ve even grown a cute little sugar pumpkin.
The one that escaped the trellis to the ground should be perfect for Halloween–if we last that long!
Tweetables:
Growing vegetables using laundry rinse water. Click to Tweet
The ease of putting in and using a graywater system. Click to Tweet
As an ex-Californian, I can relate to the water issues.
Very nice description of what you did, and how it worked. If a garden were a remote possibility here in New mexico, I’d give graywater serious thought, But the soil here…ugh. Getting anything but stuff you don’t want to grow is almost impossible.
Bravo on this post.
Wonderful post and spectacular veggies!
For two years when I was a teenager, we had a septic tank, and Dad put the drain for the washing machine into the garden. We were in northern Arizona, sandy soil and not much rain. As it turned out, the veggies we watered with the hose did poorly, and we got nothing from most of the garden, but the watermelon and cantaloupe (watered with phosphate-rich washing-machine water) did beautifully.
My husband expected the same, Cheryl, believing the plants would like the phosphates. They taste just fine!
Fantastic! Yeah for taking the initiative to reuse waste water! Lots of water wasted in toilets too, so I challenge you to investigate humanure system…perhaps your next project?
Would that be a self-composting toilet?
Not allowed in my neighborhood, but I have read about them! 🙂