Will plants with Nitrogen toxicity go back to normal green color after they recover.

Dear growmie, Just serve her some ph water for a week when dry, it'll finish out just fine as long as it is corrected asap.

Once damaged they will stay damaged. New leaves will tell you what's going on.

If the leaves are still green and not suffered chlorosis or severe deformation then it should turn back into lush green in a few days (you can see changes in the first couple of days) after treating the toxicity. Check the runoff pH and EC for indication on your medium's conditions, flushing is nice but a normal irrigation with plain water wont reduce the medium salinity by much but you'll need to keep running water through the pot until the desirable conditions are achieved! (sometimes flushing can take more than 3 times the pot size in water!) Hope this helps! Good luck and happy growing :)