The leaves continue to elongate as the blooming season progresses. The most commonly grown species, P. rosea , is best grown in a rich, wet soil that does not dry out in the summer. Propagation is by division as it comes into spring growth or by seed. Easy to grow in fertile, water retentive soil, they can be free- flowering and long lived. Most are winter hardy, by should not be allowed to dry out in the summer.
Propagation is by division after flowering or by seed.
HP elatior elatior col. Iron Mountains elatior var. These robust perennials are easy to grow in a moist, fertile soil that does not dry out. They make excellent bog or stream side plantings that flower in May and June. The flowers are very attractive to hummingbirds and butterflies.