We've spent the last 3 years working on growing our rose bushes tall, but this year very few exsisting canes are turning green and sprouting leaves. it seems like there is only new growth canes at bottom. We did have a late snow in April, is it possible all the canes are dead?

Up until now the entire bushes have always filled out each spring with no problem .

Or is there a way to prune to encourage leaves in the exhausting canes?

Or maybe I just need patience?

Thanks!
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I fixed your other picture

Scratch the canes and see if they're green underneath. If not, they have died for some reason or other. You have growth but that might be from the root stock. Can you see if that growth is above or below a graft?

You also have a lot of winter die back that you need to cut out.

To test how far to cut back a cane, cut off some of it and if you don't see white pith (soft white center), you are looking at dead wood. Keep cutting until you reach live wood.