I am sorry but I had to laugh at this
, most people would gladly give you their dandelions, they love tended gardens and grow, yes like weeds.
Dandelions growing naturally do not form big clumps as in the middle of your lawn and look quite beautiful, so go for it, just watch the flower 'clocks' or you may have very unhappy neighbours.
I have a couple of birds that have been difficult to entice any fruit or veg into, it is just patience and follow any suggestions members provide. Different parrots have different likes and dislikes, different ways they can be persuaded, just keep trying and trying and trying, I have a macaw at the moment who is being a Grand Dame when fresh food is in her bowl, every blooming day. Never stop trying, it could take a while so again, patience. Have you tried eating the veg with her?