Grass, rushes, reeds, sedges… what’s the difference? A traditional rhyme can help distinguish and identify:
“Sedges have edges,
Rushes are round,
Grasses have knees that bend down to the ground”
After Kindrogan, Tim Johnson came to Northumberland on his way south and had a couple of days with the Northumbria Basketry Group. His account of the workshop is here: http://www.timjohnsonartist.com/blog/exploring-twined-structures-with-the-northumbrian-basketmake.html
These examples used mainly rush, with other assorted local materials.