Alstroemerias are more often called either Peruvian Lilies or Lilies of the Incas and are native to South America. Peruvian Lilies come in a variety of warm colors like pink and orange and are symbolic of friendship, wealth and devotion. These flowers bloom in late spring/early summer when exposed to direct sunlight and watered weekly (water more often when you notice soil looking dry, water less when the soil looks soggy).
This article is taken from petal talk.