84-91 Days to maturity. Verbena x hybrida. Verbena Quartz XP Series Seeds. Non-GMO, Perennial. Verbena Quartz XP Series seeds are a classic and award-winning addition to any home or garden this season. Quartz XP Series verbena seeds are AAS and Fleuroselect gold medalists for their garden performance, mildew resistance, and "matching all the criteria required for a good summer flower." Quartz XP Series verbena seeds are easy to grow and proven ideal for the hot, drought-prone gardens of the southwest.