Weed Department
Idaho State Noxious 
Weed Law
Perennial Pepperweed


General Description: Perennial pepperweed normally grows 1 to 3 feet tall but may reach up to 6 feet.

Flower Description: Flowers are milky white and are formed into dense rounded clusters at the branch tips. They have 4 sepals and 4 petals.

Leaf Description: Leaves are alternate, waxy, and have smooth or toothed margins. They have a prominent whitish midvein.

Stem Description: Multiple stems emerge from a woody base.

Fruit/Seed Description: Rounded to egg-shaped silicles (seed pods) form that are compressed and 0.09 inches (2.4 mm) long. Silicles with stigma present at tip.


Interesting Facts:

It forms dense infestations that can turn into monocultures. Accumulations of its semi-woody stems degrade nesting habitat for wildlife. It can also displace more desirable species which poses a particular threat to natural areas and hay meadows.