CHRIS DAWE / SCIENCE PHOTO LIBRARY CHRIS DAWE / SCIENCE PHOTO LIBRARY
Teasel (Dipsacus fullonum) in early summer. The teasel, native to Europe and introduced to North America, can reach a height of 1.8 metres. It grows in the open and can thrive in harsh soils. Up until the middle of the twentieth century it was used to "tease" the nap on woolen fabrics - a process known as "fulling" or "brushing". This encouraged air pockets, making the material both softer and warmer.
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