Photo courtesy Dean Swan, Washington State University (retired)
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- Provincial Noxious Weeds
- Perennial sow-thistle is a creeping rooted perennial growing 0.4
to 1.5 metres tall; stems branch near the top; leaves with weak
marginal prickles clasp the stem; plants contain a bitter milky
juice; upper stalks and flower bracts usually covered in
gland-tipped hairs; yellow flowers up to 3.8 cm broad
- often confused with annual sow-thistle (Sonchus oleraceus)
(Provincial Noxious) which is taprooted and has
much smaller flowers (less than 2.5 cm across) or spiny annual sow
thistle (Sonchus asper) which has sharp, spiny leaves and
smaller flowers.
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