Look on Amazon etc. for Garden of Joy by James Searles.
Also: for best visual relationship between width of bed and height of shrubs look for kinds represented as growing about 6 ft. tall (the arborvitae at the end is way too tall for a bed only 4 ft. deep. And is probably having adverse effects on the roof).
Since you are talking about being interested in non-woody plants as well a good general layout would be evergreen shrubs at the ends with non-woody plants making up most of the bed, including the center. And deciduous shrubs forming transitions in visual weight between these two zones. Something like say, (coming from each end) some dwarf conifers at the corners with dwarf lilacs etc. next and then a long run* of ornamental grasses and so on.
You might be able to use the southerly aspect to extend the season of garden flower color with things like crocus that would probably pop out earlier there.
Regarding the helper maybe a spring tooth can be attached to the back of the tricycle, to assist with loosening the soil prior to planting.
*In order for the different plant sizes to appear balanced in relation to one another there should be a much larger area occupied by short ones than tall
Q
