11. Wait. Growing rock candy is a slow process. You’ll start to see some crystals by day two, but they will reach their peak growth after two weeks. 12. Get your candy. Whenever you’re ...

Cover each jar loosely with plastic wrap. Let stand at room temperature, undisturbed, until crystals form on sticks and rock candy is desired size, 5 to 14 days. Every few days, break up any thin ...