Cheshire,
United Kingdom 
do wallflowers last only one season
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wallflowers page
8 Jun, 2010
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Answers
Depends which kind you mean. Erysymum is a perennial type. There are biennial types which you plant at the end of one year to flower in the spring of the following year.
9 Jun, 2010
wallflowers will flower everyear.But will not flower all year round
9 Jun, 2010