ANY ideas for this?

This small patio next to a storage shed came with my house. I have to continuously shovel off dort and mud that washes on to it. I'd like to place a small greenhouse on the patio but need to correct this dirt problem. I do have a lot of old bricks that I could build a small wall to block the dirt but not sure if that fully addresses my issue. I hope you can see it is quite a slope into the patio and a ledge of earth adjacent to the patio.