Indigo Spires is a hardy plant, loves neglect and tolerates drought conditions. Regular deep watering will improve performance though. This is also a salvia that thrives in heat and humidity, which is good news for those in more tropical areas. Like most salvias, Indigo Spires does not like wet feet, so good drainage is important even though humidity is welcomed. If salvias spend winter in water logged ground, they will generally suffer and subsequently the plant dies.