İ tried growing rue a few times over the years, but the seedlings always failed after a certain point. There is no necessity for growing in my case, because an infinite abundance of high quality wild rue grows over vast landscapes starting a few hours of drive from where I live, so I didn't push on. The climate conditions and soil are very important. Too damp conditions will not work, and the soil it consistently grows on is always very light gray colored, bordering on white - highly calcerous, alkaline soil. Your soil does not look very promising, but who knows.