Mock orange bush
My mock orange has not begun budding at all; in fact it looks dead. I have seen others that look the same. Is this normal for this time of year in Missouri?
Check the branches; do they bend or break and snap off?
Scratch the bark; you should see green under the bark if the branches are still alive.
If you are seeing other Mock Orange Slow to bud or leaf out, it is likely to timing.
You can also talk with your County Extension Office to see if they have any info on the regions shrubs and the weather effects in the garden.
Here are some links with more information.