I had a winterberry as a foundation planting. I don't know what sort. The snow and ice sliding off the roof broke the branches every year, so it always looked like it was recovering from a catastrophe. I dug it up and moved it.

I'm in zone 5, NE. I will admit that my porch roof is almost impossible to clear snow from and that the snow melts in the sun and refreezes at night and so there are always big chunks of ice falling off it. Your mileage may vary.

Any specific cultivars new on the market will have no consumers who can report on long term experiences with them.

A couple of general comments:

Sigrid’s comment about snow sliding off the roof casing damage is on the mark if your mom’s roof is aimed to dump snow on this area. My plantings under eaves are either perennials or shrubs that either tolerate snow getting dumped on them when we have to rake the roof after really heavy snow, or ones that I can cut to ground level in spring if there is damage and they will regrow quickly.

You will want some evergreens, either conifers or broadleafed. Otherwise even with the berries, dried hydrangea flowers, and red stems this area will look stark in winter. Consider adding evergreen groundcovers under the shrubs as well for times when there isn’t snow.

I don’t grow any of those particular cultivars, but grow other cultivars of all those plants. Several of them I wouldn’t consider of multiple seasons of interest.

There are comments on Bobo on both the perennials forum and the Hydrangea forum. It has a long season of bloom (4 months here), and some H. Paniculata varieties have some fall color. I like leaving the dried blossoms on for added winter interest.

Bobo on Perennials Forum. Bobo in Hydrangeas Forum

Winterberry is a holly which like all hollies have separate sexed shrubs. So in order to get berries, you need a male that blooms at a compatible time to pollinate Berry Poppins; in this case Mr. Poppins is marketed for that purpose. My Winter Red suckers energetically, but I don’t know if BP does. I love winterberry but its only real season of interest is fall since the berries ar often eaten by birds in winter. Pollinators love winterberry holly so it does have summer value, but it is fairly unobtrusive during the growing season as far as human ornamental value.

Clethra is interesting when it blooms for a couple of weeks in August here and then my Ruby Spice has lovely yellow autumn foliage. Just a green mound in spring and summer and a twiggy mound in winter.

Cornus Arctic Fire has autumn color and red winter twigs, but all the nonvariegated Cornus shrubs in my experience are just green mounds for most of the growing season. I have yet to see one that I would value the flowers or berries as ornamental, though this one may be different. It suckers, and to get the bright red winter twigs, older branches need to be cut out periodically.

Koren spice Viburnum has heavenly scented spring flowers that waft the scent well, and some cultivars have nice fall color which Spice Girl is said to have. It will also spend the summer as a green mound. Most Viburnums need a different cultivar (or a wild type) to have fruit as most aren’t self-compatible.

the best sources of info.. on the WWW .. use proper latin names ... i will do the first for you .. and found the latin in one of the links

https://duckduckgo.com/?q=Hydrangea+Bobo&t=ffcm&ia=web

i then to it to this page

https://duckduckgo.com/?q=Hydrangea+paniculata+Bobo&t=ffcm&ia=web

and then flipped to the images page

https://duckduckgo.com/?q=Hydrangea+paniculata+Bobo&t=ffcm&iax=images&ia=images

and then bobs your uncle ...

as to planting check out this link.. and good luck .. ken

https://sites.google.com/site/tnarboretum/Home/planting-a-tree-or-shrub