After visiting a home this summer I was amazed at the wonderful raised-flower-beds that lined the garden walkways. Mobility-challenged residents assisted with selecting and directing the arrangement of fresh and dried/gelled floral bouquets, and and kept a watchful eye on needed upkeep to the beds. Their chairs did not fit under the beds, but easily came along-side. Since the beds were fairly narrow the plants were easy to reach from the side of the chair.
The beds were made to rest on top of low cabinets, with the soil-line at about chair-arm or slightly higher height. One cabinet was simply an empty recessed-box to camouflage potted flowers kept within, while others were regular soil-bed, and simple hinged doors in the cabinets kept an assortment of tools handy for those assisting with the garden.
I love the idea that he will be able to orchestrate the hybridization