Hello Alex,
This link is a pdf document published by the Afhanistan Governments Counter Narcotics Directorate. I believe it answers every possible question you could have about the Opium Harvest.
Page 9 specifically displays the harvesting times by region. The later pages gives textual details of the information summarised in Page 9.
www.unodc.org/pdf/publications/rapid_assessment_afghan_2003.pdf
It seems to say that most harvesting takes place in the Afghani Spring.
With kind regards,
Duncan
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