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Report an Invasive Species

Small touch-me-not

Small touch-me-not

Small touch-me-not

(Impatiens parviflora )

Priority: -  Control

Tags: Terrestrial

Identification and Reproduction

Identification: 

  • Also known as small-flowered jewelweed, is an annual flowering plant.
  • It grows up to 60 cm in height, with a shallow root system.
  • Its leaves have toothed edges and are alternate in arrangement.

  • It has small pale yellow flowers, appearing like a pouch.
  • Small touch-me-not is spread by seeds which burst out if its seed pods.

Reproduction: 

Reproduces by seed. 

Habitat & Ecology

  • This plant is typically found in forestlands and forest edges. It invades forest edges, disturbed sites, edges of waterways, and prefers moist soil.
  • Because of its small and inconspicuous form it has gone unnoticed and is much more widespread than thought. 

Impacts

Ecological: 

  • Small touch-me-not can quickly disperse across the forest floor. This can effect forest regeneration. 
  • It crowds out native species and ultimately reduces biodiversity. 

Management

Mechanical/Manual Control: 

  • Since this plant has a shallow root system it is fairly easy to hand pull. It is recommended to pull when soil is damp so roots will be removed as well. 
  • Avoid treatments during flowering stages. Any disruptions may cause seeds to disperse further around the site. 
  • Do not compose; dispose the plant properly at the landfill.

Resources

For more information check out the Washington State: Noxious Weed Control Board's page on Small-flowered Jewelweed here. Note this is a US resource and Canadian guidelines and regulations may differ. Be sure to read product labels carefully. 

E-flora BC  provides a good guide on how to properly identify small touch-me-not. 

Header photo (Syrio).