Gene: Shiny geranium is a really challenging weed to stop. Best to burn or very tightly bag and send to transfer station. I have found that shiny geranium doesn't compete well with grass so, if it makes sense, seed  grass in the areas that get some sun. Since grass doesn't  do well in shade, that tool is out. Very deep mulching (using arborist chips) can help. Unfortunately, annual/biennial native plants don't compete well with shiny geranium. Woody plant do. Hope this helps. Chip Bubl OSU/Columbia Extension Agent-retired. You can still reach me directly at <personal data hidden> if you have more questions.