As we were evaluating your designs, we realized that our brand might not be clear enough. The name GRO is short for growth. The rx in the US stands for "prescription". A "prescription" is something a doctor gives you to make you feel better (at least in our country). So the tagline might be "Your solution (prescription) for growth".
We are looking for a design that is cool (hip), unique (different), high energy, and one that says "our company is THE solution if you want to grow your business.