The Rose of Sharon bushes arrived this afternoon. They're all in pretty good shape, if a little dry, so they'll get a good watering shortly. They are bigger than I thought they'd be and blooming! They are covered in buds, so lots of blooms for the future. Mom likes the color.

Very pretty! I know you and you mom will enjoy those for many years!
You are going to enjoy those Rose of Sharon for years to come.
*Puts on Nursery Manager Hat*
Don’t be stingy on the pruning. They can get ‘leggy’ if they’re not kept in check every few years.
But if you’re NOT going to prune, give them each a lot of room to spread out:
7. Pruning Is Not Required
If you don’t have the time or inclination to prune a rose of Sharon every year or so, rest assured it won’t hurt the plant. This shrub does not require pruning to grow and flower well. Given its speedy growth rate, rose of Sharon will reach its full size in a couple of seasons, so make sure to plant it where it can freely expand. Note that the branches of plants that are not pruned often develop an irregular, somewhat floppy habit, giving the plant an informal appearance.
Good primer here on when and how to prune:
https://www.bhg.com/how-and-when-to-prune-rose-of-sharon-8349539