Ragweed on the move

This plant (called ambroisie in French) is extremely allergenic and is spreading rapidly. It is reckoned that 10-20% of people susceptible in the Rhone valley area are already affected by this invader. The south west is also seeing the spread of the weed which seems to grow in any kind of ground.
 Ragwort not ragweed is particularly harmful to horses (donkeys too).
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