Figures 6 through 17 are some pictures and my comments of different raised, accessible garden beds. They may provide you with some ideas to help you create your own.
Figure 6 - This raised garden bed provides excellent knee space and allows the gardener to work facing the garden bed rather than having to turn sideways. However, it is to wide, as the gardener could not reach the full bed.
Figure 7 - This raised garden bed provides excellent accessibility and knee room form one side and would require a lot less earth to fill the raised garden bed as it does not go all the way to the ground.
Figure 8 - These raised garden bed provide access from both sides, however there should be a walkway made of firm material around both sides of the beds.
Figure 9 - This raised flower bed has excellent knee room and a narrow bed so access from only one side is needed. However, the gravel bed on the ground could cause some problems for the front wheels on a wheelchair.
Figure 10 - This raised garden bed has a raised bottom which provides good knee space and drawers for garden tools.
Figure 11 - This raised flower garden has a raised bottom that rests on the horizontal 2 x 6 lumber. Note, the irrigation piping on the left end of the bed.
Figure 12 - This raised flower bed is designed in the shape of a X. It has a raised bottom and good knee access.
Figure 13 - A variety of raised flower beds, all with raised bottoms. In the foreground a piece of 3 foot diameter corrugated spiral metal culvert pipe is used to create the garden bed.
Figure 14 - The centers of these raised garden beds would be difficult to access for someone in a wheelchair because of the depth of the top layer of bricks around the beds.
Figure 15 - The width and lack of a solid walkway around this raised garden bed would make working on it difficult for someone in a wheelchair.
Figures 16 & 17 - These are very large raised beds using concrete walls. Access around the beds is on a concrete walkway. However, the beds are too wide for an individual in a wheel chair to reach.