First: Rape seed and canola makes little difference. Up here we used to grow and call it rape.
Then they developed a variety with less of a certain acid,and called it canola,
In northern Saskatchewan is a town that had a sign by the road: Jonestown,The Rape Capitol of Canada".
But the sign is gone.
About crystalisation: You've got to warm the frames to extra,most of the time.
I have some cans yet from last year,hard as concrete!
But the bees can do well on Canola.
Depends on the weather,
Greetings from Alberta,Canada.