Do you grow plants for your budgies? This is a very good way to provide them with healthy greens. Container gardening is fairly easy, time saving and take up little space. Many flowers are edible too. Best to use organic soil.
Here is a list of what can be grown in containers: Basil, Beets, Broccoli, Celery, Chamomile, Cilantro Dandelion, Fennel, Kale, Mustard Greens, Plantain, Pansies, Peas, Rosemary and Swiss Chard. Right now I am growing wheat grass for my birds and cat. Some flowers that are safe: Bee Balm, Borage, Butterfly bush, Sweet William, Fennel, Dill, Lavender, Lilac, Marigolds, Nasturtium, Red Clover, Sage, Yarrow, Violet.
The soil should not have pesticides or chemical fertilizers. Containers should be made completely of non toxic materials. The soil should not be in reach of your bird.
Small pinecones make for good toys that can be safely played with. Best to get newly fallen pine cones. Put in oven at 200 degrees for 20 minutes. Then turn oven off and let the cones stay in oven for 2 hours to dry out. Do not heat higher than 200 degrees. My birds were afraid of them at first so gradually introduce them.
Grasses and Grain seeds can be sprouted. Some examples are Barley, Buckwheat, Millet, Oats, Quinoa and Wheat. Legumes must be fully sprouted, Examples are Adzuki, Fenugreek, Lentil, Mung and Peas. Budgies seem to love Pea sprouts. You can also purchase a mix of sprouting seeds.
Dried seeds are little treasure chest of nutrients. Have fun growing for your birds!