Clark County, NV Invasive Plant Rules: Prohibited Species (2026)

Clark County falls under Nevada's statewide noxious weed regulations administered by the Nevada Department of Agriculture (NDOA) under NRS 555 and NAC 555.010. The NDOA noxious weed list includes species that property owners may be required to control or eradicate. Key invasive species affecting southern Nevada include: tamarisk/salt cedar (Tamarix spp.) — an aggressive invasive tree that consumes 200–300 gallons of water per day and crowds out native riparian vegetation along the Colorado River and Las Vegas Wash; giant reed (Arundo donax) — found along waterways; Sahara mustard (Brassica tournefortii) — a rapidly spreading desert invasive; and Russian thistle (tumbleweed). Water spinach (Ipomoea aquatica) is classified as a federal noxious weed and is prohibited by the NDOA. Giant hogweed (Heracleum mantegazzianum) is also prohibited due to its toxic sap. The Clark County Wetlands Park actively manages invasive species including tamarisk and tall whitetop (Lepidium latifolium). For residential and commercial landscaping, the SNWA maintains a Water Smart Plant List of desert-adapted species suitable for southern Nevada. While not a prohibition list, it represents a positive guidance approach to prevent water waste and discourage planting of water-intensive, potentially invasive species.