Perennial Sow Thistle (Sonchus arvensis)

This photo was taken in my garden during July 2012.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/25
Aperture - f10.0
Lens - Canon EF 100mm f2.8 Macro USM
Focal Length - 100mm
ISO - 800
Filter - Hama Polariser
Tripod