Answer the following Q with stream of consciousness. Passage: When conditions are favorable for swarming, the queen will start laying eggs in queen cups. A virgin queen will develop from a fertilized egg. The young queen larva develops differently because it is more heavily fed royal jelly, a protein-rich secretion from glands on the heads of young workers. If not for being heavily fed royal jelly, the queen larva would have developed into a regular worker bee. All bee larvae are fed some royal jelly for the first few days after hatching but only queen larvae are fed on it exclusively. As a result of the difference in diet, the queen will develop into a sexually mature female, unlike the worker bees.

Question: Based on this passage, when does the queen bee start laying eggs?
To answer the above question, the relevant sentence is: When conditions are favorable for swarming, the queen will start laying eggs in queen cups. Therefore, the final answer is When conditions are favorable for swarming.