Most amaryllis will go dormant naturally and re-bloom sometime during winter. However, many people prefer to force their amaryllis into bloom for the holiday season. To force bloom for the winter holidays, cut back the flower
stalk after blooming stops, but allow the foliage to grow. You can place your plant outdoors for summer, if you like, in partial shade. Keep watered so the soil is moist, but not wet. Stop feeding in the month of August. When it’s time to bring plants indoors, in September or October, move your Amaryllis to a cool (55 to 60 degrees F.), dry spot and stop watering it. The foliage will already be dying back. If you want your Amaryllis to bloom at a specific time, Thanksgiving or Christmas, count backwards about 10 - 12 weeks, to determine when to stop watering, and cross your fingers. The lack of foliage and water will induce the amaryllis to send out another flower
stalk. Resume watering at this time and move the plant to a warm, sunny spot. Leaves will follow shortly and then blooms. When the flowers
fade, start the process over.