Time for pruning these is after they've flowered, so about now, really. Shouldn't get this kind of damage to weigela as a result of winter, it's fully hardy. Is it in a pot?

Thanks, it's in a narrow raised border, but can I prune it hard because most of the branches are bare except for 6-7 inc hes at the ends which have leaves. A few flowers are still on but most have finished. It is a variagated leaf variety. the centre of the shrub is totaly devoid of leaf.

Thanks for your reply. It is in a narrow raised border. The end 6-7 inches of each spur has leaves and dead flowers except for a few recent flowers. It is a variagated leaf variety, the leaves seem smallerthan I remember and the centre of the shrub is totaly devoid of leaf.

Yes you can prune it now, not sure I'd take it right to the ground, but that's your decision. I'm still curious as to why its happened though - is your raised bed on a solid surface or open to the soil beneath? If its onto a solid, then that might be why it's done what its done.