Tag Archives: Perennial Sow Thistle

Project 366 – Post No. 168 – Perennial Sow Thistle

What is Project 366? Read more here!

The Identification Guide for Alberta Invasive Plants has nearly 90 species listed. Twenty one of the species have yellow flowers. The other flower colours include white, purple, pink, red, green, blue and orange. Today’s invasive plant is the Perennial Sow Thistle (Sonchus arvensis), a member of the sunflower family. It has yellow, dandelion-like flowers that are grouped in loose clusters at the ends of stem. Like most invasive species in Alberta it was introduced to North America from Europe and Asia. It reproduces prolifically through underground rhizomes and wind dispersed seeds. Apparently a single plant can produce up to 13000 seeds and each seed can remain viable for 3-6 years. Along the Whitemud Creek there are still large stands of flowering Perennial Sow Thistle

Perennial Sow Thistle (Sonchus arvensis) at Whitemud Ravine. September 9, 2019. Nikon P1000, 67mm @ 35mm, 1/60, f/3.5, ISO 100

May the curiosity be with you. This is from “The Birds are Calling” blog (www.thebirdsarecalling.com). Copyright Mario Pineda.