Perennial Pepperweed (Lepidium latifolium)
Perennial pepperweed (also known as perennial peppercress, tall
whitetop) is a non-native
invasive plant that is originally from southeastern Europe and Asia. This
noxious weed has spread at an alarming rate throughout portions of the western
United States over the last 15 years. It establishes large monocultural stands
that exclude and compete with all other plant species. In terms of grazing it
is low in protein and difficult for grazing cattle to digest. Perennial
pepperweed stems originate from large below-ground roots that allow rapid
growth of shoots. Shoots remain in a rosette form for several weeks before the
internodes elongate and stems are produced. Rosette leaves may persist through
winter months in mild areas with infrequent frost. Dense clusters of white
flowers are produce from late spring through the summer. Although perennial
pepperweed produces viable seed, there has been little evidence of seedling
germination in the field. Its main method of spread appears to be the lateral
production of new shoots via the root system. This plant is major problem in
parts of central and northern California, and other western states, but it is
presently only scattered within San Diego County. We want to get rid of this
noxious plant before it really takes a hold. If you see this plant, PLEASE
report it!
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More information on perennial
pepperweed:
POSTER for
perennial pepperweed:
8.5"x11"
size, 2.2 MB JPEG file 11"x17"
size, 3.2 MB JPEG file OR for a limited number of copies, contact wma@smslrwma.org. |
Distribution
maps of perennial pepperweed:
Perennial
pepperweed control projects:
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Poster |
NOTE: If your browser automatically opens this file it will be a HUGE size on your screen. Right click on the link and select 'Save As'. You will then be able to open the JPEG file with Photoshop or some other program to view and print it. |
If you see this plant, please
report the location to wma@smslrwma.org or Bill Winans, County
Agriculture (858) 694-2777 If you are uncertain of your identification of this plant contact us or the County Agriculture Office. Also check out our images of perennial pepperweed (see above). |
