Good grey water filtering plants
Fri, 11 Nov 2011 22:06:48 PST
Possibly Iris pseudacorus might be an option for the filtering process.   I 
have no idea if I. pseudacorus is an approved species in California/So. 
California but the species has been used
in Europe for this purpose.

No doubt Dennis Kramb and Jim Waddick will be able to add valuable 
information on this topic.

Darlene Cook
Auckland, New Zealand

-----Original Message----- 
From: Lee Poulsen
Sent: Saturday, November 12, 2011 6:22 PM
To: PBS Society
Subject: [pbs] Good grey water filtering plants

I recently received a Facebook email from someone I don't know who found me 
while perusing the PBS wiki. (I live close to her, so she contacted me.) She 
doesn't belong to the list (and didn't even know what it was) so I told her 
I would ask and see what all the experts here might suggest. Here is her 

"We are putting in a grey water system and we want a reed bed to filter the 
water. However, I don't want invasive reeds in my garden and I read that 
another choice might be Crinum Lillies i.e. Hymenocallis Occidentalis, 
Crinum Americanum as well as a couple of Iris species. As an expert, I 
wonder if you know where to buy any of these plants?"

First I told her I wasn't an expert. ;-)
Then I mentioned that there are probably a lot more choices of Crinums, 
Hymenocallis, and both Iris species as well as Iris hybrids (such as the 
Louisiana and Japanese Iris hybrids and relatives) that she might really 
like to try.

I have no clue as to which are good water filtering plants however. Or if 
there are other genera that might be good for this, including non-bulbous 
plants, that also aren't invasive. I'm hoping that there are some good 
plants that are both good at filtering water AND have amazing flowers, etc. 
She lives on the side of one of the hills near downtown L.A. which has an 
extremely mild climate (virtually never reaches 0°C and rarely gets very hot 

Any ideas from the experts out there?
--Lee Poulsen
Pasadena, California, USA - USDA Zone 10a
Latitude 34°N, Altitude 1150 ft/350 m

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