If you use prepackaged potting soil, it contains a wetting agent for uniform water dispersal.  However, after about a month of repeated waterings, the wetting agent has washed away.  You know when this happens because your soil begins to have a crusty surface and water just sits on top or runs off without penetrating the soil.  The result is - your plants are not receiving water at their roots where they need it.

Wet-N-Grow replaces the wetting agent that was originally in the potting soil when you bought it.  By adding a 5 cc amount to your watering can once a month, you keep the soil in good condition to accept water and disperse it uniformly through the soil to your plants' roots.  It is not a fertilizer and can be used with fertilizers and with moss.  It is biodegradable and not harmful to children or pets unless swallowed.