In California and here in Sacramento there are resources like the California Invasive Plant Council data-base (
http://www.cal-ipc.org) and the Sacramento River Watershed Program data-base (
http://www.sacriver.org/aboutw...) that are up to date .Chasmanthe floribunda is listed by CIPC as already naturalized in California. ( 2a. Plants already naturalized in California (although not on Cal-IPC’s Inventory) and sold in California.) Definitions: “Naturalized” = listed as naturalized by the Jepson Manual, does not include species that have been
present in California since before 1940 without becoming invasive
“Sold in California” = listed in the Sunset Garden Book or the Plant Locator (Western Region). The bottom line on this one for California is that its here. I have not seen it seed in HamiltonSquare and its an acre with large clumps at each end. Three in total. I have not seen it growing any where in Sacramento county other than in a garden. We are at the confluence of two rivers and enjoy a Mediterranean climate in a fertile valley. Its always best to check the invasiveness status for your particular region. Here there are regulations for the sellers and agriculture/conservation rule the roost. Thanks Kelli for keeping a watch full eye out! I think I'd better look-up this Knapweed I have vigorously seeding about.......
