I have never had any problem when it comes to feeding my parakeets vegetables or fruits.But this was due to certain circumstances and I would like to let you know these circumstances so that you can also follow them and make your Pet birds to eat vegetables and fruits.
First of all I never had just one bird at home, I have always had more than five, including lovebirds,parakeets and cockatiels.
Lovebirds and cockatiels naturally have a tendency to eat vegetables and fruits which the parakeets do not posess due to thier small beaks. My parakeets first started to eat vegetables and fruits when they saw my lovebirds and cockatiels eating them and just followed thier fellow companions, they seemed to love it actually! So you need to show them that the vegetables and fruits are tasty and good to eat, you can do this by eating the vegetables and fruits yourself even, I’m not kidding!
Another way is to mix the fruits and vegetables in thier food mix of seeds and hence they have to bite at it if they want to eat. Then you need to hope that they like it and start eating the vegetables and fruits regularly on thier own.
Another way is to tie small parts of the fruits and vegetables to the parakeets favourite toys and hence hope that they eat it while playing with thier toys. This works really well if your birds have favourite toys.
Another way is to buy fruit and vegetable vitamins drops and put them in water, this is a sure fire way to get the vitamins and nutrients into them but the water may get contaminated soon and needs constant replacement.
I have written several such methods in my blog, I have even added HD videos of my parakeets learning from my lovebirds to eat vegetables and fruits as well as my parakeets eating coriander and chillies and how to hand feed them vegetables.So please see the links below.