I have a large outdoor patch of catnip for my cats. It was growing essentially fine, but I decided to "help" it by dumping a whole bag of 16-16-16 chemical fertilizer on it, figuring if some was good, more was better. It killed most of it almost instantly - some of the plants wilted within hours! (The bag said "feeds 3000 sq ft" and this was a patch probably 200-300 sq ft, so....)

Now I'm trying to save the remaining few plants any way I can. I've tried soaking the soil repeatedly, but they just keep dying. The edges of the leaves are "burned" looking and whole plants 2-3 feet tall have died.

My question is, what do I do? Scrape off the top part of the soil? Keep flooding it with water? Stop watering it? Take cuttings? (I'm afraid of killing the few remaining plants if I start taking cuttings.)

Help, ye gardening experts! Help!