The plant can disrupt the flow of water in a site, causing erosion. It has a lovely yellow flower, and spiky, spiny grey green foliage, which tends to be distributed on California coast lines. This thistle is another one of those plants that crops up in disturbed areas, like roadsides, pastures, and waste sites. It’s very hard to control, as it can spread via seed or vegetation. Like some of the aquatic weeds we’ve covered, it forms mats that build nutrients in the soil and allow other noxious weeds to invade the region. It was originally used as an ornamental due to its beautiful flower, but quickly spread around California in almost all of the biomes in the state. The Highway Iceplant is also known as the Hottentot-fig, which I think is a much better name for this nasty weed. Distribution – how much of California land is affected by the invasive species?īecause this is a huge list, you can either scroll through normally or click a plant that you want to learn more about. Invasiveness – how effectively does it take over the areas it invades?.Impact – how large is the effect it has on the environment?.Each plant has a score from A – C on the following: The following 39 plants are the most invasive species in California as ranked by the California Invasive Plants Council. They run a ton of tests and studies to come up with their list and I’ve included some of the details below. I personally can go on a quick canyon run and spot a handful right off of the bat.įollowing the great comments on my post about invasive species sold at garden centers, I wanted to get deeper into invasive species. If you’re a gardener in California (or other states in the Pacific Northwest), chances are good you’ve had to battle one of these 39 invasive species.
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