84-91 days. 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 for "matching all the criteria required for a good summer flower." Verbena Quartz XP Series seeds mature into tight 10-12 inch dwarfs perfect for window boxes, hanging baskets, or for reviving a tired flower bed. Quartz XP Series verbena seeds are easy to grow and proven ideal for the hot, drought-prone gardens of the southwest.