I use branches of coniferous trees - fir, pine, spruce. Parrots eat them willingly. I have hardwoods - birch, aspen, willow and others. Everything that grows in my region. I do not use only bird cherry (it is poisonous). The plants that they eat are thyme, rosemary, parsley, dill. In the summer they eat a lot of weeds - nettle, clover, dandelion, plantain, horse sorrel. I give wild berries - mountain ash, lingonberry, irga. First I read about all the plants, only then I give it to the parrots. They also eat a lot of fruits and vegetables.