LRP - Licenses

LRP - Regulations

LRP - Permits

Recreation - Statewide

Recreation - Trapping

Recreation - Fishing

Recreation - Hunting

Env. Protection - Management

Env. Protection - Emergency

Env. Protection - Resources

To sign up for updates or to access your subscriber preferences, please enter your contact information below.



 
Siberian peashrub

Siberian peashrub
(Caragana arborescens)

Shrub or multi-stemmed tree in the pea family, with individual yellow flowers.



Overview

Regulated areas of Siberian peashrub
This species is Restricted (Orange counties)

Other names for this plant include:

  • Common names: Siberian peatree, pea tree
  • Scientific names: Caragana arborescens var. pendula; Caragana fruticosa; Caragana arborscens var. redowskii; Caragana sibirica; Robinia altagana var. fruticosa; Robinia caragana

Ecological threat:

  • Invades coniferous and hardwood forests, plantations, forest edges, savannas, trails, right-of-ways.
  • Reported as invasive throughout much of the Upper Midwest and Great Plain states.
  • Extremely adaptable to variety of soil conditions, salt, and cold temperatures.
  • Contains nitrogen-fixing microbial symbionts, altering natural soil chemistry and associated plant communities.
  • Inhibits growth and establishment (allelopathic) to some grasses.
  • Produces a chemical that reduces herbivore predation and pathogen establishment.

Classification in Wisconsin: Restricted (cultivars Lorbergii, Pendula, and Walkerii are exempt)

Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. The recommendation for Siberian peashrub was based upon this literature review developed by the department.

Identification

Leaves & stems: Shrub or multi-stemmed tree. Alternate, pinnately compound leaves with 8-12 leaflets. Young leaflets are silky in texture, while mature leaflets are hairless. Tips of leaflets contain a spine.

Flowers: Yellow, singular flowers characteristic of the pea-family. Flowers are fragrant and borne on long stalks.

Fruits & seeds: Seeds borne in 1-2 inch pods, smooth and brown with sharply pointed tips. Pods eject seeds when mature.

Roots: Nitrogen-fixing symbionts form nodules on the roots.

Distribution

Caragana arborescens
Counties in WI where Siberian peashrub has been reported (as of July 2013). Both vouchered and unvouchered reports included.

Do you have Siberian peashrub in your county but it isn't shaded on the map? Send us a report.

Control

Mechanical:

  • Dig up individual plants. For larger populations, mow as close to the ground as possible. Continual mowing is needed as plants rapidly re-sprout.
  • Cover the infestation with black landscape fabric/plastic in early spring, when leaves emerge. Keep covered for a minimal of one growing season.
  • Consecutive prescribed burns may be a successful control option, with sufficient fuel loads and fire-appropriate habitats.

Chemical:

  • Cut-stump treatment with glyphosate.
  • Cut-stump or basal bark treatments in fall with triclopyr.

Photos

View Siberian peashrub pictures in our photo gallery!

Resources

Sources for Content:

  • Shortt, Katelyn B., Vamosi, Steven M. 2012. A review of the biology of the weedy Siberian peashrub, Caragana arborescens, with an emphasis on its potential effects in North America. Botanical Studies, 53:1-8.
  • Minnesota Department of Natural Resources
  • National Park Service

Links for More Information:

Last revised: Monday December 11 2017