I rescued some old iris at a grape farm that had been sprayed with grape chemicals 4 years ago. One cluster has bloomed 3 times but every bloom is deformed in a different way. Another cluster bloomed this year, and appears to be the same one, but not damaged. Question: would the chemicals permanently alter the blooms or should I just dispose of that cluster. They are all noids, and the reproduced ones are also damaged, so far. How long to wait to repair?