The many plants close to that you are "respiratory" and releasing water, as well. The phrase is called "transpiration", and While a Brussels sprout doesn't have a mouth, it's very small holes in its leaves that make it possible for water to depart the leaf, by way of evaporation, https://water-cycle-science-for-k69045.life3dblog.com/20187427/a-review-of-water-cycle-science-for-kids