My advice before spending a lot of money is to consider some of the cheaper ways to make your garden more accessible.
Raised beds can be made from anything that will hold soil, even old car tyres. Most gardening tools can be easily adapted making buying new ones unnecessary.
.......Grouping containers together and placing saucers under them, as well as mulching the soil and watering in the evening, when there is less evaporation all saves water and time.
If because of a disability or age, gardening, planting, weeding and watering is becoming a problem, but you enjoy being in your garden and doing it, keep it simple. Light and often is better for your general well-being, and for your garden.
Ground cover shrubs will help keep weeds down and add interest. Low growing fruit trees give colour and the benefit of the Autumn harvest. list of ground cover plants.
Garden on a steep slope.
This Wheeled gardening seat is a great gardening aid if you suffer from a bad back that makes bending difficult it reduces the stooping and bending associated with weeding and planting etc.
The swivel tractor-type seat lets you sit and work up to 23" above the ground and roll around on four large 10" diameter pneumatic tires.The tray under the seat is handy to carry your gardeners tools along with you..
Most of the gardening tips on this page, together with the use of some specially adapted tools, will help if you are gardening from a wheelchair. The most important design factor will be easy access to your garden and to be able to get around the garden with ease.
A garden designed or adapted for wheelchair access and mobility can look good and a be a blessing.