The large, neon pink flowers of Amalfi amaryllis (Hippeastrum 'Amalfi') bear a white central star, and are produced in clusters atop stout stems that can reach 2 feet in height. This cultivar is ideal for forcing indoors in the winter, as the bulbs reliably come into flower six weeks after the onset of watering.
Plant bulbs in well-drained soils in a container 2 inches wider than the bulb. Leave the neck of the bulb sticking up above the soil level. Once the leaves and flowering stalks start to emerge, move the amaryllis to a bright location, and rotate the pot to discourage the flowering stalk from falling towards the light. Amalfi produces two scapes (flowering stalks) whose buds come into flower sequentially, provided an extended period of bloom.
After the amaryllis flowers, keep it in the sunniest possible location, and move outdoors after the danger from late spring frosts has passed. Water and fertilize as for any container plant during the summer. In September, begin to decrease watering to encourage the bulb to enter dormancy, and bring indoors to a cool, dry location prior to the first killing frost. Once indoors, cease watering and remove dried leaves. Bring back into a sunny, warm location, and resume watering about six weeks before flowers are desired.