Good Morning Greg, 

Thank you for contacting the U of M Extension Service. 

From viewing your photos, it appears you have a lot of shade, especially if your photos were taken mid-day. It may be a situation where the trees have grown and shade your garden more than they did in the past.  

A full sun plant will require 6-8 hours of sunlight a day. I believe your barberrys require more sun. The weigela and the hydrangea can handle some shade, but will thrive in more sun, depending on the hybrid. 

I would watch your garden during the day to see how many hours of actual sunlight your garden is getting. 

Please click on the following link from the U of M Extension Yard and Garden website: 

https://extension.umn.edu/planting-and-growing-guides/gardening-shade

Here is another link that will discuss arborvitae: https://extension.umn.edu/trees-and-shrubs/choosing-evergreens-your-landscape

From viewing your soil test, the pH is a little high. Here is a link about pH: 

https://blog-fruit-vegetable-ipm.extension.umn.edu/2021/10/does-your-soil-have-high-ph-fall-is.html

Good Luck!

Good Morning Greg,

With a high pH you don't want to install plants that require acidic soil. A few of these plants are blueberries and rhodendron. Most plants and shrubs will have a tag that indicates if it needs acidic soil. 

Here is another link about care of the arborvitae: https://extension.psu.edu/the-mighty-arborvitae#:~:text=Arborvitae%20Care,need%20irrigation%20during%20dry%20spells.

This information states: 

Arborvitaes grow best in full sun, though they can take some light shade. They prefer moist, well-drained soil but have been known to adapt to poor soil and rocky conditions. They are not drought-tolerant and may need irrigation during dry spells. Unlike many conifers that require acidic soil to thrive, arborvitaes can tolerate a slightly acidic to alkaline pH (6.0 to 8.0).

If you decide to leave the arborvitae in the same spot, you might consider a wood chip mulch a few inches away from the trunk to about a foot or so. The chips will protect the roots, keep them cool and moist. The arborvitae might struggle in the shade, also. 

I believe hostas would thrive in your spot. There is a "hosta glade" at the Minnesota Landscape Arboretum where the plants are labeled. You could choose some hosta plants from viewing the plants there. 

Good Luck!