Hi K, It is invasive here in the SF Bay Area of California with a little summer water. If you can completely starve them with no water, that will be the end of them. If that is not possible, then I suggest digging. Cheers, Bracey San Jose CA -----Original Message----- From: pbs-bounces@lists.ibiblio.org [mailto:pbs-bounces@lists.ibiblio.org] On Behalf Of Kathleen Sayce Sent: Tuesday, April 22, 2014 6:24 PM To: pbs@lists.ibiblio.org Subject: [pbs] Arum italicum Working on a wetland mitigation site last week, I found three patches and two seedlings of Arum italicum. My question to the PBS members in temperate climates is this: How invasive is this species? It's listed as invasive in the state of Oregon, which is 25 miles to the south, and it's in a natural area that is supposed to be left alone. I suspect it needs to come out, though that may be difficult, given the likelihood of deeply rooted corms. Kathleen