There is nothing unusual about a line cord from this sort of fixture. Some Fl. fixtures can be purchased with a simple factory installed line cord. Just be attentive in doing same and make sure there's a strain relief on the cord. By the way, where else but from the ceiling would you mount it?
Be sure the power cord doesn't catch on sharp metal edges. You can use a clamp that screws into the 3/4 inch or so round hole that most fluorescent shop light fixtures have for stringing wires through, and this protects the cord.
Do you get coverage you can count on? From the bag of fertilizer? From your lawn sprinklers?