Noxious Weeds

Monitor List

This page is under construction. Plant descriptions are not complete. Check back for updated information.

The purpose of the monitor list is to gather more information on suspect weeds, as well as monitor for occurrence or spread. Information collected may be used to justify future inclusion on the state noxious weed list. There is no legal or regulatory aspect to this list (WAC 16-750-025). Download a printable copy of the monitor list.

Reasons for inclusion:

  1. 1. Reason to believe this species is invasive or poses a potential threat to Washington.

    2. Additional information is needed on distribution, abundance or biology.

    3. The species was once present in Washington and on the State Noxious Weed List. It is now being monitored for reoccurrence.

    4. Need to verify existence (site investigation), verify identification and/or obtain voucher specimen.

    5. It exists in an adjacent state or province or occurs on an adjacent state or province's noxious weed list and is not known to occur in Washington.

Native species of Washington will not be included on the monitor list. Each weed on the monitor list will be included by vote of the noxious weed committee and will require a sponsor for monitoring.

For more information on these species, please contact the sponsor or the State Noxious Weed Board at noxiousweeds@agr.wa.gov or 360-725-5764.

Click 'details' for more detailed information and photos on each plant.

 

Bachelorís button
Centaurea cyanus

details
Balkan catchfly
Silene csereii

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Bladder senna
Colutea arborescens

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blooddrops
Adonis annua

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bouncing-bet
Saponaria officinalis

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cherry laurel
Prunus laurocerasus

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Crack willow species

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creeping fieldcress
Rorippa sylvestris

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distaff thistle
Carthamus lanatus

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Dyerís greenwood
Genista tinctoria

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English holly
Ilex aquifolium

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Eurasian frogs-bit
Hydrocharis morsus-ranae

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European mountain ash
Sorbus aucuparia

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featherhead knapweed
Centaurea tricocephala

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giant reed
Arundo donax

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Inula
Inula helenium

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Italian arum
Arum italicum

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large periwinkle
Vinca major

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lovegrass sedge
Cyperus eragrostis

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moleplant
Euphorbia lathyris

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multiflora rose
Rosa multiflora

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narrowleaved crosswort
Crucianella angustifolia

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pampas grass
Cortaderia spp.

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periwinkle
Vinca minor

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silverlace vine
Polygonum aubertii

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silvery cinquefoil

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skeleton-leaf bursage
Ambrosia tomentosa

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spotted jewelweed

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swollen bladderwort
Utricularia inflata

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tall verbena
Verbena bonariensis

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unicorn-plant
Proboscidea louisiana

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venice mallow
Hibiscus trionum

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water hyacinth
Eichhornia crassipes

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watercress

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