My daughter in Hollister bought me Campanula Get Mee, she bought them in Gilroy Walmart for Mother's Day but what happen is it was full of gnats. I went on your website and was told to put vinegar & soap mixture in the soil. I did that but all the flowers died and I had to cut them back to just the stalk. Will the plant come back or die completely if I continue to water it and keep it in the sun? Could you let me know at this stage what to do?