Window box, Window shelf
I'm not physically limited, but I thought this might be helpful to some of you.
I have deer and critter problems, so a couple of years ago, I leaned a couple of cedar posts (10 feet long kind) against my house along a side that happens to include my bathroom and kithcen windows. I then suspended a wide shelf from the posts, a little lower than the windows. I place pots of plants on the shelves. I can care for the plants by opening the window...
Another variation; With long pieces of wire, I suspend large baskets from my eaves. Lots of them, so that by the time the plants really get going, it's a mass of plants.
Hope this gives you some ideas. Good luck.