Can saltwater assistance plants grow? What is in the plant that will net the plant grow or...

What is in the plant that will net the plant grow or not grow? Explain.
I own 4 beauitful sunflowers plants outside yes...
Answers:    With a few, very dogmatic exceptions (sea plant life, similar to kelp), and a few plants accustomed to living near the shore and tolerant of brackish (AKA "halophytes"), sea hose is deadly poison for plant go. This is because the high saline content of sea sea supplies dangerous level of sodium.

Salt "robs" the roots of water . . . pulling marine molecules away from capillary roots and dehydrating the plant.
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Saltwater will NOT help plants grow, unless they're the deep plants such as seaweed. For any plants in your home or garden, saline water will most expected kill them.