British Columbia: Spraying roses with dormant oil

I am wondering if it is too late to spray roses with dormant oil in the Vancouver area (BC). One of the roses is already starting to leaf out.

Thanks,

 

Sorry that no one replied, I'm just getting a chance to review posts from late January now.

As you suspected, though, once the leaves are out, it's too late for dormant oil.

For future reference:

The Rose Growers Calendar from the Vancouver Rose Society

 

May I ask what dormant oil is? Or, as I imagine it is self explanatory, how it works and why one would wish to use it?

 

Just What Is Dormant Oil? from University of Illinois Extension

Horticultural Oils from Colorado State University Extension

Dormant Spraying of Fruit Trees and Deciduous Shrubs from Univ. of Arkansas Extension (includes audio version of text from their gardening podcast)

 

Thank you :)