What would happen if you applied saltwater to a plant?
The plant will face stress and its growth will be stunted
It depends, if you are mixing half saltwater and half freshwater it is still saltwater but with less salt. If you are watering the plant with freshwater then saltwater it will most likely have a normal outcome because it would then be much less saltwater and be less likely to kill the plant . If this doesn't help how about conducting an experiment?