Answer: This plant is a heat and sun-loving plant; it needs full sun all day long, warm temperatures, evenly moist yet well drained soil, and ample nutrients to grow and bloom well. I suspect it has become less vigorous over time due to being cut back and moved indoors every year. In your relatively short growing season, you may need to try to keep it in active growth all year, or at least try to start it into active growth indoors before it is time to take it back outside for the summer. You may need to use supplemental lighting to do this, in addition to keeping it in a very bright room. For best blooming, do not let it get colder than 55 degrees. Finally, make sure it is well fertilized while in active growth. I repot each spring and add compost to the potting mix along with composted manure, apply a slow release fertilizer and then also fertilize regularly with a water soluble fertilizer such as 20-20-20. This would be excessive for most plants, but in this case it does seem to help.
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