Because pearly everlasting is native to poor, dry soils, it tolerates droughts and nutrient-deficient soil. That said, like most perennials, pearly everlasting grows and does best when watered regularly—especially during periods of drought or unseasonably hot weather. It also requires regular watering the first year after planting to help it get established in the garden and develop a strong root system. Because it spreads by underground stems, pearly everlasting can be a bit of a thug in the garden and behave invasively if you water regularly and fertilize abundantly....