Pruning a hebe hedge

Could anyone tell me when is the right time to prune a hebe hedge?

Many thanks....

 

Hello, RYDALL. We just recently had this question asked and the correct time to do it is May, conveniently enough!

 

... Or after flowering

 

Thanks Lady of Leisure and Celia. I will set about it with my shears...

 

After flowering? Mine flower 12 months a year.

 

You're lucky Rich. I love hebes and before we moved I had several which took turns to flower. So far this year the 2 I have now have done nothing. Perhaps they are building themselves up for next year