Early flower stage
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Yellow clematis can smother trees
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Late season fire hazard in the seed stage. Also it is difficult and time consuming to remove in industrial areas.
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Y. clematis flowers and seedheads - Calgary, Oct 2013
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Y. clematis smothers large shrubs in a parking lot in Calgary
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Y. clematis crawls vigorously in parking lot in Calgary, Oct. 2013
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Y. clematis crawls up a large shrub in Calgary
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