By Carolann_f
United Kingdom 
my sea thistle has grown to about 3 feet and suddenly wilted and looks deformed with greyish splatters around the big bottom leaves
9 Jun, 2014
Answers
The description reminds me of broad leafed plants that have been sprayed with a selective herbicide. Is your garden bordered by a field of cereal crop?
9 Jun, 2014
Possibly too wet at the roots? In the ground or in a pot? They love the sun and good drainage
HC
9 Jun, 2014