On a few occasions, I have been complaining how difficult it is to obtain good quality pellets at reasonable prices. Even with reasonable prices, the quality of pellets are horrendous. Thanks to Dawn of Willow Run Rabbitry for giving me a nudge to start doing research on natural diet. I do feed my adult rabbits fresh vegetables on a daily basis. I have also started limiting their pellets to 1/4 cup (250ml) per 6 lbs body weight. Two common vegetables that I normally give are Bok Choy and Celery chopped into small pieces. Based on Suggested Vegetables (House Rabbit Society), I should also include Mustard Greens for Vitamin A. That would be 3 types of vegetables per day as suggested as well. Why only these 3? Because they can be easily obtained at the grocery stores and supermarket. Most of the suggested vegetables are unavailable and uncommon here.
For those who are unfamiliar with how these vegetables look like, here are some photos:
Mustard Green
Bok Choy
Celery
Note: I am no rabbit diet expert so follow these at your own risk and discretion. DO NOT FEED fresh vegetables to rabbits BELOW 6 MONTHS of age.
Tru-Luv Rabbitry: Quality Holland Lops in Malaysia 
You may add in fresh mint. Mint helps when rabbits get upset tummies, so I add fresh mint to my bunnies’ diet whenever available in hopes that it will keep tummy issues at bay 🙂
Just don’t give mint to a lactating doe, it or sage will help dry up milk (useful if you want to do so if they’ve lost a litter though!)
I personally have fed kits greens, but only when the Mommas are getting greens as part of their diet all along. They grab the greens right out of Moms mouth! :O
I do second the info that you do research info on a natural diet and start any changes slowly. I try to feed mine a “bunny salad” of different kinds of dark leafy greens so they don’t get too much of any one kind.
some of the things that my rabbits have enjoyed include orgainc edible flowers for salads, apple cores, carrot tops, a little broccoli, spinach, kangkong, kale, sweet potato leaf, grass and weeds with seed.
Thanks Pet Epicure for the sharing. Really appreciate it! If not mistaken too much of potato leaf and kangkung may cause wind in the stomach. I believe everything in moderation would me alright.