What Is a Queen Cup?
A queen cup is a small, open, cup-shaped structure of wax that worker bees build, usually along the edges or bottom of frames. It looks a bit like the base of an acorn cap and hangs with its opening facing down. A cup is the starting point for a queen cell. Until an egg or larva is placed in it and bees begin drawing it out, it is just an unused cup.
Queen Cup vs. Queen Cell
The terms are often mixed up. A common way to separate them:
- Queen cup: an empty or newly started cup with no developing queen inside.
- Queen cell: a cup that has been drawn out into a longer, peanut-shaped cell that holds a developing queen larva or pupa.
If you see a cup, look inside with a flashlight for an egg or larva. For identifying drawn cells and what type they are, see queen cells in the hive.
What Empty and Charged Cups Mean
Many healthy colonies keep a few empty cups. Finding them does not by itself mean the colony will swarm. What matters is whether cups contain eggs or larvae and how many there are, along with colony strength, crowding and the time of year. Cups with larvae, especially several along the bottom of frames in a crowded hive, can be a sign of swarm preparation. Cups in the middle of a comb face may suggest supersedure or emergency queen rearing. Interpretation is not always clear-cut, so consider the whole colony before acting.
Artificial Queen Cups and Grafting
Beekeepers who raise queens buy or make plastic or wax cups and mount them on bars. In grafting, a young larva (generally under a day old) is transferred into one of these cups, which is then given to a prepared colony to be drawn out and fed. See the overview of raising queen bees for how this fits among other methods. Some beekeepers let bees clean or prime new cups before use, though practices differ.
What to Do When You Find Queen Cups
- Note whether each cup is empty or has an egg or larva.
- Check space: is the colony crowded or running out of room to lay or store nectar?
- Look for the queen (how to tell a queen from a worker) and recent eggs.
- Decide whether to give more room, make a split, or keep watching and inspect again in about a week.
Removing cups alone is generally not a reliable way to prevent swarming, because bees can build new ones.
FAQ
Is the queen bee the only female in the hive?
No. Workers are also female, but they do not normally mate and lay fertilized eggs. The queen is the colony’s main egg layer.
What is the process of grafting a queen bee?
Grafting moves a very young worker larva into an artificial queen cup so the colony raises it as a queen. See our raising queen bees guide.