This word comes directly from the French verb “remonter,” which translates to “coming up again.” It’s most often used in relation to plants that bloom more than once a year. Remontant hydrangeas have two distinct periods of flowering growth. The first flush of growth occurs on old wood, or last year’s stems. The second flush begins in late summer or early autumn on new wood, the most recent stems. In the southeastern United States, these hydrangeas experience their first flush in late May or early June and their second sometime in September.