I have a Chocolate Hab that is almost 3 and a half feet tall by 3 feet wide but it has no flowers on it! It had about 12 blossoms that popped up a few weeks ago but they all fell off even though I tried to stimulate pollination by poking them a little with a brush. Since then there has been no more blossoms coming out. Is this a nutrient problem or is it something else? Should I be worried?