Rabbits can eat a variety of vegetables, at around 10-20% of their recommended diet, but it's important to introduce new foods gradually to avoid upsetting their digestive systems.

Here are some vegetables that are generally safe for rabbits:

Leafy Greens:

Romaine lettuce
Butterhead lettuce
Kale (in moderation)
Spinach (in moderation)
Bok choy

Herbs:

 

 

Other Fruit & Vegetables:
Carrots (in small amounts as an occasional treat)
Bell peppers (green, red, yellow)
Cucumber
Celery 
Green beans
Watermelon as a hydrating treat

It's essential to avoid giving rabbits fruit and vegetables that are high in starch or sugar, as those that can cause digestive issues.

Examples of vegetables to avoid include:
Cabbage and cauliflower can cause gas.
Broccoli and Brussels sprouts can cause digestive upset
Lettuce varieties like iceberg lettuce are not as nutritious and can cause diarrhea in large amounts.

 

As with any dietary change Introduce new vegetables slowly and watch for any signs of digestive upset, such as changes in stool consistency or decreased appetite.