Start giving it light feeding with a good soluble plants food like Jack’s Classic Blossom Booster.  Mix it at 1/2 strength and feed it every couple of weeks.  It should start to grow leaves quivckly as the days grow longer.  Around the end of May, it can go outside for the summer but give it a shady spot at first and gradually move to a sunnier place over a couple of weeks.  At that point you can start feeding it every 2 weeks at the normal dilution rate of the food.