By Traceyb
Lancashire,
United Kingdom 
I have a passion flower with a white powdery residue on the stem, as yet it hasnt started to regow after winter.
On plant
Passiflora
20 Apr, 2010
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Previous question
Could be mildew, spray with a fungicide, assuming the plant is still alive and you're not talking about dead stems.
20 Apr, 2010