Freezing flowers into ice cubes is a breeze. It's even easier than picking flowers. The most important thing when making flower ice cubes, however, is to make sure that the flower isn't poisonous. As the cube melts, the pollen, petals, and stems will be exposed to the drink, and you don't want to get sick.
Before adding your flowers to your ice cube tray, make sure the flowers are clean, just like you would any fruit or vegetable before eating. For some edible and food-safe flowers, consider using lavender, carnations, chamomile, roses, marigolds, squash blossoms, or violets. Blossoms from herbs, such as thyme, basil, or mint, are great for freezing into ice, too.
With larger flowers, you can freeze into larger molds or only use the petals in smaller molds. And just like you'd build a bouquet for a vase, you can combine different flowers into a single cube. If you're feeling fancy, you can make round floral ice to decorate your punch bowls or other large-batch drinks.