Can rabbits eat citronella

No, rabbits shouldn't eat citronella. Citronella is the name for both an essential oil, and a group of trees/shrubs (mostly growing in tropical climates).

• Citronella oil - Rabbits shouldn't eat or lick any essential oils, they're just too potent.
• Citronella plants - Although not listed on the popular lists of plants known to be toxic to rabbits, that doesn't mean they aren't toxic. These lists (one is linked below) are always important to consult but they can't be perfectly complete.

There are many foods that are safe for rabbits to eat -- it's best to stick to those. If your rabbit has already eaten citronella (either oil or plant), do the same thing you should do whenever rabbits eat something possibly unsafe: watch for signs of illness (and respond appropriately if illness occurs), and encourage lots of hay eating and water drinking. See related questions below for more help.