In my area, rapeseed ( we call it Canola ) is the major honey plant. It
granulates very quickly and my approach is to extract every week during
the flow. It is quite difficult to deal with once it has begun to
granulate.
 
The crop here is usually quite low moisture content and we can
get away with extracting combs which just show a band of capping along the
top edge. If you wait until the comb is fully capped it is often too late.
 
Honey can be melted in the comb without destroying the comb but it is
fairly tricky to do. An ounce of prevention is worth a pound of cure!
 
Probably the most cost effective way to clear the combs of granulated
honey is to feed it back to the bees in the spring.
 
 
Donald Aitken
11710-129 Street
Edmonton Alberta Canada
T5M 0Y7